DOC: grammatical mistakes
- [ ] closes #xxxx
- [ ] tests added / passed
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

Hello @Giftlin! Thanks for updating the PR.



Cheers ! There are no PEP8 issues in this Pull Request. :beers: 

##### Comment last updated on September 13, 2017 at 11:36 Hours UTC # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/17512?src=pr&el=h1) Report
> Merging [#17512](https://codecov.io/gh/pandas-dev/pandas/pull/17512?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/f6d4d7078d49503adf990f0c159eb603ca1f0c1a?src=pr&el=desc) will **decrease** coverage by `2.25%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/17512/graphs/tree.svg?height=150&width=650&token=eZ4WkYLtcO&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/17512?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #17512      +/-   ##
==========================================
- Coverage   91.18%   88.92%   -2.26%     
==========================================
  Files         163      163              
  Lines       49543    49543              
==========================================
- Hits        45177    44058    -1119     
- Misses       4366     5485    +1119
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `88.92% <ø> (-0.03%)` | :arrow_down: |
| #single | `?` | |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/17512?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/io/stata.py](https://codecov.io/gh/pandas-dev/pandas/pull/17512?src=pr&el=tree#diff-cGFuZGFzL2lvL3N0YXRhLnB5) | `93.66% <ø> (ø)` | :arrow_up: |
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/pull/17512?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `25% <0%> (-58.34%)` | :arrow_down: |
| [pandas/io/sql.py](https://codecov.io/gh/pandas-dev/pandas/pull/17512?src=pr&el=tree#diff-cGFuZGFzL2lvL3NxbC5weQ==) | `46.59% <0%> (-48.22%)` | :arrow_down: |
| [pandas/core/computation/pytables.py](https://codecov.io/gh/pandas-dev/pandas/pull/17512?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvY29tcHV0YXRpb24vcHl0YWJsZXMucHk=) | `62.5% <0%> (-29.88%)` | :arrow_down: |
| [pandas/io/pytables.py](https://codecov.io/gh/pandas-dev/pandas/pull/17512?src=pr&el=tree#diff-cGFuZGFzL2lvL3B5dGFibGVzLnB5) | `64.29% <0%> (-28.5%)` | :arrow_down: |
| [pandas/io/feather\_format.py](https://codecov.io/gh/pandas-dev/pandas/pull/17512?src=pr&el=tree#diff-cGFuZGFzL2lvL2ZlYXRoZXJfZm9ybWF0LnB5) | `71.42% <0%> (-14.29%)` | :arrow_down: |
| [pandas/core/computation/common.py](https://codecov.io/gh/pandas-dev/pandas/pull/17512?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvY29tcHV0YXRpb24vY29tbW9uLnB5) | `78.57% <0%> (-7.15%)` | :arrow_down: |
| [pandas/core/computation/expr.py](https://codecov.io/gh/pandas-dev/pandas/pull/17512?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvY29tcHV0YXRpb24vZXhwci5weQ==) | `84.03% <0%> (-4.46%)` | :arrow_down: |
| [pandas/io/clipboard/clipboards.py](https://codecov.io/gh/pandas-dev/pandas/pull/17512?src=pr&el=tree#diff-cGFuZGFzL2lvL2NsaXBib2FyZC9jbGlwYm9hcmRzLnB5) | `22.78% <0%> (-3.8%)` | :arrow_down: |
| [pandas/io/formats/console.py](https://codecov.io/gh/pandas-dev/pandas/pull/17512?src=pr&el=tree#diff-cGFuZGFzL2lvL2Zvcm1hdHMvY29uc29sZS5weQ==) | `66.66% <0%> (-3.04%)` | :arrow_down: |
| ... and [5 more](https://codecov.io/gh/pandas-dev/pandas/pull/17512?src=pr&el=tree-more) | |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/17512?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/17512?src=pr&el=footer). Last update [f6d4d70...45979b0](https://codecov.io/gh/pandas-dev/pandas/pull/17512?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/17512?src=pr&el=h1) Report
> Merging [#17512](https://codecov.io/gh/pandas-dev/pandas/pull/17512?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/f6d4d7078d49503adf990f0c159eb603ca1f0c1a?src=pr&el=desc) will **decrease** coverage by `2.25%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/17512/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/17512?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #17512      +/-   ##
==========================================
- Coverage   91.18%   88.92%   -2.26%     
==========================================
  Files         163      163              
  Lines       49543    49543              
==========================================
- Hits        45177    44058    -1119     
- Misses       4366     5485    +1119
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `88.92% <ø> (-0.03%)` | :arrow_down: |
| #single | `?` | |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/17512?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/io/stata.py](https://codecov.io/gh/pandas-dev/pandas/pull/17512?src=pr&el=tree#diff-cGFuZGFzL2lvL3N0YXRhLnB5) | `93.66% <ø> (ø)` | :arrow_up: |
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/pull/17512?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `25% <0%> (-58.34%)` | :arrow_down: |
| [pandas/io/sql.py](https://codecov.io/gh/pandas-dev/pandas/pull/17512?src=pr&el=tree#diff-cGFuZGFzL2lvL3NxbC5weQ==) | `46.59% <0%> (-48.22%)` | :arrow_down: |
| [pandas/core/computation/pytables.py](https://codecov.io/gh/pandas-dev/pandas/pull/17512?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvY29tcHV0YXRpb24vcHl0YWJsZXMucHk=) | `62.5% <0%> (-29.88%)` | :arrow_down: |
| [pandas/io/pytables.py](https://codecov.io/gh/pandas-dev/pandas/pull/17512?src=pr&el=tree#diff-cGFuZGFzL2lvL3B5dGFibGVzLnB5) | `64.29% <0%> (-28.5%)` | :arrow_down: |
| [pandas/io/feather\_format.py](https://codecov.io/gh/pandas-dev/pandas/pull/17512?src=pr&el=tree#diff-cGFuZGFzL2lvL2ZlYXRoZXJfZm9ybWF0LnB5) | `71.42% <0%> (-14.29%)` | :arrow_down: |
| [pandas/core/computation/common.py](https://codecov.io/gh/pandas-dev/pandas/pull/17512?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvY29tcHV0YXRpb24vY29tbW9uLnB5) | `78.57% <0%> (-7.15%)` | :arrow_down: |
| [pandas/core/computation/expr.py](https://codecov.io/gh/pandas-dev/pandas/pull/17512?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvY29tcHV0YXRpb24vZXhwci5weQ==) | `84.03% <0%> (-4.46%)` | :arrow_down: |
| [pandas/io/clipboard/clipboards.py](https://codecov.io/gh/pandas-dev/pandas/pull/17512?src=pr&el=tree#diff-cGFuZGFzL2lvL2NsaXBib2FyZC9jbGlwYm9hcmRzLnB5) | `22.78% <0%> (-3.8%)` | :arrow_down: |
| [pandas/io/formats/console.py](https://codecov.io/gh/pandas-dev/pandas/pull/17512?src=pr&el=tree#diff-cGFuZGFzL2lvL2Zvcm1hdHMvY29uc29sZS5weQ==) | `66.66% <0%> (-3.04%)` | :arrow_down: |
| ... and [5 more](https://codecov.io/gh/pandas-dev/pandas/pull/17512?src=pr&el=tree-more) | |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/17512?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/17512?src=pr&el=footer). Last update [f6d4d70...32f2164](https://codecov.io/gh/pandas-dev/pandas/pull/17512?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 thanks!