DOC: Remove incorrect periods at the end of parameter types (#23597)
- [x] closes #23597
- [x] passes `git diff master -u -- "*.py" | flake8 --diff`

Hello @meiermark! Thanks for submitting the PR.

 - There are no PEP8 issues in the file [`pandas/core/dtypes/inference.py`](https://github.com/meiermark/pandas/blob/3a680577c1096aec4928767f8046f6f4242352a4/pandas/core/dtypes/inference.py) !

 - There are no PEP8 issues in the file [`pandas/core/generic.py`](https://github.com/meiermark/pandas/blob/3a680577c1096aec4928767f8046f6f4242352a4/pandas/core/generic.py) !

 - There are no PEP8 issues in the file [`pandas/core/indexes/datetimes.py`](https://github.com/meiermark/pandas/blob/3a680577c1096aec4928767f8046f6f4242352a4/pandas/core/indexes/datetimes.py) !

 - There are no PEP8 issues in the file [`pandas/core/indexes/multi.py`](https://github.com/meiermark/pandas/blob/3a680577c1096aec4928767f8046f6f4242352a4/pandas/core/indexes/multi.py) !

 - There are no PEP8 issues in the file [`pandas/core/indexes/range.py`](https://github.com/meiermark/pandas/blob/3a680577c1096aec4928767f8046f6f4242352a4/pandas/core/indexes/range.py) !

 - There are no PEP8 issues in the file [`pandas/core/series.py`](https://github.com/meiermark/pandas/blob/3a680577c1096aec4928767f8046f6f4242352a4/pandas/core/series.py) !

 - There are no PEP8 issues in the file [`pandas/core/strings.py`](https://github.com/meiermark/pandas/blob/3a680577c1096aec4928767f8046f6f4242352a4/pandas/core/strings.py) !

 - There are no PEP8 issues in the file [`pandas/io/clipboards.py`](https://github.com/meiermark/pandas/blob/3a680577c1096aec4928767f8046f6f4242352a4/pandas/io/clipboards.py) !

 # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/23600?src=pr&el=h1) Report
> Merging [#23600](https://codecov.io/gh/pandas-dev/pandas/pull/23600?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/f6917110611dcd1978286419529a85eca293fd00?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/23600/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/23600?src=pr&el=tree)

```diff
@@           Coverage Diff           @@
##           master   #23600   +/-   ##
=======================================
  Coverage   92.25%   92.25%           
=======================================
  Files         161      161           
  Lines       51262    51262           
=======================================
  Hits        47292    47292           
  Misses       3970     3970
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.64% <ø> (ø)` | :arrow_up: |
| #single | `42.33% <ø> (ø)` | :arrow_up: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/23600?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/core/indexes/multi.py](https://codecov.io/gh/pandas-dev/pandas/pull/23600/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9tdWx0aS5weQ==) | `95.46% <ø> (ø)` | :arrow_up: |
| [pandas/io/clipboards.py](https://codecov.io/gh/pandas-dev/pandas/pull/23600/diff?src=pr&el=tree#diff-cGFuZGFzL2lvL2NsaXBib2FyZHMucHk=) | `100% <ø> (ø)` | :arrow_up: |
| [pandas/core/series.py](https://codecov.io/gh/pandas-dev/pandas/pull/23600/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvc2VyaWVzLnB5) | `93.7% <ø> (ø)` | :arrow_up: |
| [pandas/core/dtypes/inference.py](https://codecov.io/gh/pandas-dev/pandas/pull/23600/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZHR5cGVzL2luZmVyZW5jZS5weQ==) | `98.38% <ø> (ø)` | :arrow_up: |
| [pandas/core/indexes/datetimes.py](https://codecov.io/gh/pandas-dev/pandas/pull/23600/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9kYXRldGltZXMucHk=) | `96.13% <ø> (ø)` | :arrow_up: |
| [pandas/core/strings.py](https://codecov.io/gh/pandas-dev/pandas/pull/23600/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvc3RyaW5ncy5weQ==) | `98.58% <ø> (ø)` | :arrow_up: |
| [pandas/core/generic.py](https://codecov.io/gh/pandas-dev/pandas/pull/23600/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZ2VuZXJpYy5weQ==) | `96.81% <ø> (ø)` | :arrow_up: |
| [pandas/core/indexes/range.py](https://codecov.io/gh/pandas-dev/pandas/pull/23600/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9yYW5nZS5weQ==) | `97.32% <ø> (ø)` | :arrow_up: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/23600?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/23600?src=pr&el=footer). Last update [f691711...3a68057](https://codecov.io/gh/pandas-dev/pandas/pull/23600?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 Thanks for taking care of those @meiermark 

@gfyoung we don't have the validation of docstring in place yet, I'm adding it in #22854, I'll add this error there, so it starts to be checked when merged