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

# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/21130?src=pr&el=h1) Report
> Merging [#21130](https://codecov.io/gh/pandas-dev/pandas/pull/21130?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/e033c0616158d3ba974456b4f84810492936b1fe?src=pr&el=desc) will **decrease** coverage by `<.01%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/21130/graphs/tree.svg?width=650&height=150&src=pr&token=eZ4WkYLtcO)](https://codecov.io/gh/pandas-dev/pandas/pull/21130?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #21130      +/-   ##
==========================================
- Coverage   91.83%   91.83%   -0.01%     
==========================================
  Files         153      153              
  Lines       49498    49498              
==========================================
- Hits        45458    45456       -2     
- Misses       4040     4042       +2
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.23% <ø> (-0.01%)` | :arrow_down: |
| #single | `41.88% <ø> (ø)` | :arrow_up: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/21130?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/core/base.py](https://codecov.io/gh/pandas-dev/pandas/pull/21130/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvYmFzZS5weQ==) | `96.83% <ø> (ø)` | :arrow_up: |
| [pandas/util/testing.py](https://codecov.io/gh/pandas-dev/pandas/pull/21130/diff?src=pr&el=tree#diff-cGFuZGFzL3V0aWwvdGVzdGluZy5weQ==) | `84.38% <0%> (-0.21%)` | :arrow_down: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/21130?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/21130?src=pr&el=footer). Last update [e033c06...ada091f](https://codecov.io/gh/pandas-dev/pandas/pull/21130?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 thanks!