DOC: Fix typo in timeseries.rst
Simple typo fix
# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=h1) Report
> Merging [#16590](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/31e67d5d834bd1754e1ce5cdf6725c54bf06a01d?src=pr&el=desc) will **increase** coverage by `0.17%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/16590/graphs/tree.svg?width=650&height=150&src=pr&token=eZ4WkYLtcO)](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #16590      +/-   ##
==========================================
+ Coverage   90.75%   90.92%   +0.17%     
==========================================
  Files         161      161              
  Lines       51097    49240    -1857     
==========================================
- Hits        46372    44773    -1599     
+ Misses       4725     4467     -258
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `88.68% <ø> (+0.09%)` | :arrow_up: |
| #single | `40.23% <ø> (+0.07%)` | :arrow_up: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/core/computation/expressions.py](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvY29tcHV0YXRpb24vZXhwcmVzc2lvbnMucHk=) | `0% <0%> (-90.48%)` | :arrow_down: |
| [pandas/io/msgpack/\_version.py](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=tree#diff-cGFuZGFzL2lvL21zZ3BhY2svX3ZlcnNpb24ucHk=) | `44.65% <0%> (-0.22%)` | :arrow_down: |
| [pandas/io/formats/style.py](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=tree#diff-cGFuZGFzL2lvL2Zvcm1hdHMvc3R5bGUucHk=) | `100% <0%> (+4.07%)` | :arrow_up: |
| [pandas/core/util/hashing.py](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvdXRpbC9oYXNoaW5nLnB5) | `98.34% <0%> (+5.37%)` | :arrow_up: |
| [pandas/io/json/json.py](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=tree#diff-cGFuZGFzL2lvL2pzb24vanNvbi5weQ==) | `100% <0%> (+9.63%)` | :arrow_up: |
| [pandas/util/testing.py](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=tree#diff-cGFuZGFzL3V0aWwvdGVzdGluZy5weQ==) | `100% <0%> (+19.01%)` | :arrow_up: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=footer). Last update [31e67d5...f7b3446](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=h1) Report
> Merging [#16590](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/31e67d5d834bd1754e1ce5cdf6725c54bf06a01d?src=pr&el=desc) will **increase** coverage by `0.17%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/16590/graphs/tree.svg?token=eZ4WkYLtcO&src=pr&width=650&height=150)](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #16590      +/-   ##
==========================================
+ Coverage   90.75%   90.92%   +0.17%     
==========================================
  Files         161      161              
  Lines       51097    49240    -1857     
==========================================
- Hits        46372    44773    -1599     
+ Misses       4725     4467     -258
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `88.68% <ø> (+0.09%)` | :arrow_up: |
| #single | `40.23% <ø> (+0.07%)` | :arrow_up: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/core/computation/expressions.py](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvY29tcHV0YXRpb24vZXhwcmVzc2lvbnMucHk=) | `0% <0%> (-90.48%)` | :arrow_down: |
| [pandas/io/msgpack/\_version.py](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=tree#diff-cGFuZGFzL2lvL21zZ3BhY2svX3ZlcnNpb24ucHk=) | `44.65% <0%> (-0.22%)` | :arrow_down: |
| [pandas/io/formats/style.py](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=tree#diff-cGFuZGFzL2lvL2Zvcm1hdHMvc3R5bGUucHk=) | `100% <0%> (+4.07%)` | :arrow_up: |
| [pandas/core/util/hashing.py](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvdXRpbC9oYXNoaW5nLnB5) | `98.34% <0%> (+5.37%)` | :arrow_up: |
| [pandas/io/json/json.py](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=tree#diff-cGFuZGFzL2lvL2pzb24vanNvbi5weQ==) | `100% <0%> (+9.63%)` | :arrow_up: |
| [pandas/util/testing.py](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=tree#diff-cGFuZGFzL3V0aWwvdGVzdGluZy5weQ==) | `100% <0%> (+19.01%)` | :arrow_up: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=footer). Last update [31e67d5...f7b3446](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=h1) Report
> Merging [#16590](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/31e67d5d834bd1754e1ce5cdf6725c54bf06a01d?src=pr&el=desc) will **increase** coverage by `0.17%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/16590/graphs/tree.svg?height=150&token=eZ4WkYLtcO&width=650&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #16590      +/-   ##
==========================================
+ Coverage   90.75%   90.92%   +0.17%     
==========================================
  Files         161      161              
  Lines       51097    49240    -1857     
==========================================
- Hits        46372    44773    -1599     
+ Misses       4725     4467     -258
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `88.68% <ø> (+0.09%)` | :arrow_up: |
| #single | `40.23% <ø> (+0.07%)` | :arrow_up: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/core/computation/expressions.py](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvY29tcHV0YXRpb24vZXhwcmVzc2lvbnMucHk=) | `0% <0%> (-90.48%)` | :arrow_down: |
| [pandas/io/msgpack/\_version.py](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=tree#diff-cGFuZGFzL2lvL21zZ3BhY2svX3ZlcnNpb24ucHk=) | `44.65% <0%> (-0.22%)` | :arrow_down: |
| [pandas/io/formats/style.py](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=tree#diff-cGFuZGFzL2lvL2Zvcm1hdHMvc3R5bGUucHk=) | `100% <0%> (+4.07%)` | :arrow_up: |
| [pandas/core/util/hashing.py](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvdXRpbC9oYXNoaW5nLnB5) | `98.34% <0%> (+5.37%)` | :arrow_up: |
| [pandas/io/json/json.py](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=tree#diff-cGFuZGFzL2lvL2pzb24vanNvbi5weQ==) | `100% <0%> (+9.63%)` | :arrow_up: |
| [pandas/util/testing.py](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=tree#diff-cGFuZGFzL3V0aWwvdGVzdGluZy5weQ==) | `100% <0%> (+19.01%)` | :arrow_up: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=footer). Last update [31e67d5...f7b3446](https://codecov.io/gh/pandas-dev/pandas/pull/16590?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 Thanks.