DOC: Correct minor spelling error
State: closed

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


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Comments:
# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/24770?src=pr&el=h1) Report
> Merging [#24770](https://codecov.io/gh/pandas-dev/pandas/pull/24770?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/e2bf1ff491dbdabce1590506d2b1dafca34db82e?src=pr&el=desc) will **not change** coverage.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/24770/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/24770?src=pr&el=tree)

```diff
@@           Coverage Diff           @@
##           master   #24770   +/-   ##
=======================================
  Coverage   92.38%   92.38%           
=======================================
  Files         166      166           
  Lines       52363    52363           
=======================================
  Hits        48377    48377           
  Misses       3986     3986
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.81% <ø> (ø)` | :arrow_up: |
| #single | `42.91% <ø> (ø)` | :arrow_up: |


------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/24770?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/24770?src=pr&el=footer). Last update [e2bf1ff...cd2b012](https://codecov.io/gh/pandas-dev/pandas/pull/24770?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/24770?src=pr&el=h1) Report
> Merging [#24770](https://codecov.io/gh/pandas-dev/pandas/pull/24770?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/e2bf1ff491dbdabce1590506d2b1dafca34db82e?src=pr&el=desc) will **not change** coverage.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/24770/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/24770?src=pr&el=tree)

```diff
@@           Coverage Diff           @@
##           master   #24770   +/-   ##
=======================================
  Coverage   92.38%   92.38%           
=======================================
  Files         166      166           
  Lines       52363    52363           
=======================================
  Hits        48377    48377           
  Misses       3986     3986
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.81% <ø> (ø)` | :arrow_up: |
| #single | `42.91% <ø> (ø)` | :arrow_up: |


------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/24770?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/24770?src=pr&el=footer). Last update [e2bf1ff...cd2b012](https://codecov.io/gh/pandas-dev/pandas/pull/24770?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).

Thanks!