DOC: update the pandas.Series.dropna docstring by Ankara Chapter
Checklist for the pandas documentation sprint (ignore this if you are doing
an unrelated PR):

- [ x] PR title is "DOC: update the <your-function-or-method> docstring"
- [x ] The validation script passes: `scripts/validate_docstrings.py <your-function-or-method>`
- [ x] The PEP8 style check passes: `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ x] The html version looks good: `python doc/make.py --single <your-function-or-method>`
- [x ] It has been proofread on language by another sprint participant

Please include the output of the validation script below between the "```" ticks:

```
# paste output of "scripts/validate_docstrings.py <your-function-or-method>" here
# between the "```" (remove this comment, but keep the "```")

```

If the validation script still gives errors, but you think there is a good reason
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Checklist for other PRs (remove this part if you are doing a PR for the pandas documentation sprint):

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

Hello @Neuroscitechie! Thanks for updating the PR.

 - In the file [`pandas/core/series.py`](https://github.com/pandas-dev/pandas/blob/0195a350de9a49fb6c5166d6f88f62fe6d0645d9/pandas/core/series.py), following are the PEP8 issues :

> [Line 2996:80](https://github.com/pandas-dev/pandas/blob/0195a350de9a49fb6c5166d6f88f62fe6d0645d9/pandas/core/series.py#L2996): [E501](https://duckduckgo.com/?q=pep8%20E501) line too long (81 > 79 characters)



##### Comment last updated on March 14, 2018 at 15:21 Hours UTC Hmm can you check to see if your editor changed the newline mode of the document? The diff should just be the lines you changed, not the entire file.

Ping me in the chat if you need help figuring it out. I collected edits from everyone and uploaded the file instead of updating the lines only # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/20116?src=pr&el=h1) Report
> Merging [#20116](https://codecov.io/gh/pandas-dev/pandas/pull/20116?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/840d4323935348a890d6b868f2b18e8dddd22199?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/20116/graphs/tree.svg?src=pr&token=eZ4WkYLtcO&width=650&height=150)](https://codecov.io/gh/pandas-dev/pandas/pull/20116?src=pr&el=tree)

```diff
@@           Coverage Diff           @@
##           master   #20116   +/-   ##
=======================================
  Coverage   91.72%   91.72%           
=======================================
  Files         150      150           
  Lines       49156    49156           
=======================================
  Hits        45090    45090           
  Misses       4066     4066
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.11% <ø> (ø)` | :arrow_up: |
| #single | `41.85% <ø> (ø)` | :arrow_up: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/20116?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/core/series.py](https://codecov.io/gh/pandas-dev/pandas/pull/20116/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvc2VyaWVzLnB5) | `93.85% <ø> (ø)` | :arrow_up: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/20116?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/20116?src=pr&el=footer). Last update [840d432...0195a35](https://codecov.io/gh/pandas-dev/pandas/pull/20116?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 We seem to have a conflicting PR: https://github.com/pandas-dev/pandas/pull/20204 (that one is doing both DataFrame and Series dropna) Closing in favor of #20204.