For issue #23135 Validate the description of the See Also
It makes makes sure the first letter in capitalized and there is a period at the end.
- [X] closes #23135
- [X] tests added / passed
- [ X] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
For the code I have changed....
- [ ] whatsnew entry=> Should I do it for Docstring?

Hello @percevalve! Thanks for submitting the PR.

 - In the file [`scripts/tests/test_validate_docstrings.py`](https://github.com/percevalve/pandas/blob/b2cd0faba67b42b5aa0ce5b18a33f0859f404b07/scripts/tests/test_validate_docstrings.py), following                are the PEP8 issues :
> [Line 560:80](https://github.com/percevalve/pandas/blob/b2cd0faba67b42b5aa0ce5b18a33f0859f404b07/scripts/tests/test_validate_docstrings.py#L560): [E501](https://duckduckgo.com/?q=pep8%20E501) line too long (82 > 79 characters)
> [Line 579:80](https://github.com/percevalve/pandas/blob/b2cd0faba67b42b5aa0ce5b18a33f0859f404b07/scripts/tests/test_validate_docstrings.py#L579): [E501](https://duckduckgo.com/?q=pep8%20E501) line too long (84 > 79 characters)
> [Line 587:80](https://github.com/percevalve/pandas/blob/b2cd0faba67b42b5aa0ce5b18a33f0859f404b07/scripts/tests/test_validate_docstrings.py#L587): [E501](https://duckduckgo.com/?q=pep8%20E501) line too long (88 > 79 characters)
> [Line 593:80](https://github.com/percevalve/pandas/blob/b2cd0faba67b42b5aa0ce5b18a33f0859f404b07/scripts/tests/test_validate_docstrings.py#L593): [E501](https://duckduckgo.com/?q=pep8%20E501) line too long (85 > 79 characters)
> [Line 609:80](https://github.com/percevalve/pandas/blob/b2cd0faba67b42b5aa0ce5b18a33f0859f404b07/scripts/tests/test_validate_docstrings.py#L609): [E501](https://duckduckgo.com/?q=pep8%20E501) line too long (83 > 79 characters)
> [Line 611:80](https://github.com/percevalve/pandas/blob/b2cd0faba67b42b5aa0ce5b18a33f0859f404b07/scripts/tests/test_validate_docstrings.py#L611): [E501](https://duckduckgo.com/?q=pep8%20E501) line too long (88 > 79 characters)
> [Line 622:80](https://github.com/percevalve/pandas/blob/b2cd0faba67b42b5aa0ce5b18a33f0859f404b07/scripts/tests/test_validate_docstrings.py#L622): [E501](https://duckduckgo.com/?q=pep8%20E501) line too long (86 > 79 characters)
> [Line 656:80](https://github.com/percevalve/pandas/blob/b2cd0faba67b42b5aa0ce5b18a33f0859f404b07/scripts/tests/test_validate_docstrings.py#L656): [E501](https://duckduckgo.com/?q=pep8%20E501) line too long (85 > 79 characters)
> [Line 665:80](https://github.com/percevalve/pandas/blob/b2cd0faba67b42b5aa0ce5b18a33f0859f404b07/scripts/tests/test_validate_docstrings.py#L665): [E501](https://duckduckgo.com/?q=pep8%20E501) line too long (83 > 79 characters)
> [Line 666:80](https://github.com/percevalve/pandas/blob/b2cd0faba67b42b5aa0ce5b18a33f0859f404b07/scripts/tests/test_validate_docstrings.py#L666): [E501](https://duckduckgo.com/?q=pep8%20E501) line too long (81 > 79 characters)
> [Line 667:80](https://github.com/percevalve/pandas/blob/b2cd0faba67b42b5aa0ce5b18a33f0859f404b07/scripts/tests/test_validate_docstrings.py#L667): [E501](https://duckduckgo.com/?q=pep8%20E501) line too long (85 > 79 characters)
> [Line 669:80](https://github.com/percevalve/pandas/blob/b2cd0faba67b42b5aa0ce5b18a33f0859f404b07/scripts/tests/test_validate_docstrings.py#L669): [E501](https://duckduckgo.com/?q=pep8%20E501) line too long (81 > 79 characters)
> [Line 672:80](https://github.com/percevalve/pandas/blob/b2cd0faba67b42b5aa0ce5b18a33f0859f404b07/scripts/tests/test_validate_docstrings.py#L672): [E501](https://duckduckgo.com/?q=pep8%20E501) line too long (81 > 79 characters)
> [Line 749:80](https://github.com/percevalve/pandas/blob/b2cd0faba67b42b5aa0ce5b18a33f0859f404b07/scripts/tests/test_validate_docstrings.py#L749): [E501](https://duckduckgo.com/?q=pep8%20E501) line too long (80 > 79 characters)
> [Line 772:80](https://github.com/percevalve/pandas/blob/b2cd0faba67b42b5aa0ce5b18a33f0859f404b07/scripts/tests/test_validate_docstrings.py#L772): [E501](https://duckduckgo.com/?q=pep8%20E501) line too long (82 > 79 characters)


 - In the file [`scripts/validate_docstrings.py`](https://github.com/percevalve/pandas/blob/b2cd0faba67b42b5aa0ce5b18a33f0859f404b07/scripts/validate_docstrings.py), following                are the PEP8 issues :
> [Line 166:80](https://github.com/percevalve/pandas/blob/b2cd0faba67b42b5aa0ce5b18a33f0859f404b07/scripts/validate_docstrings.py#L166): [E501](https://duckduckgo.com/?q=pep8%20E501) line too long (84 > 79 characters)
> [Line 238:80](https://github.com/percevalve/pandas/blob/b2cd0faba67b42b5aa0ce5b18a33f0859f404b07/scripts/validate_docstrings.py#L238): [E501](https://duckduckgo.com/?q=pep8%20E501) line too long (80 > 79 characters)
> [Line 324:80](https://github.com/percevalve/pandas/blob/b2cd0faba67b42b5aa0ce5b18a33f0859f404b07/scripts/validate_docstrings.py#L324): [E501](https://duckduckgo.com/?q=pep8%20E501) line too long (85 > 79 characters)
> [Line 449:80](https://github.com/percevalve/pandas/blob/b2cd0faba67b42b5aa0ce5b18a33f0859f404b07/scripts/validate_docstrings.py#L449): [E501](https://duckduckgo.com/?q=pep8%20E501) line too long (84 > 79 characters)
> [Line 463:80](https://github.com/percevalve/pandas/blob/b2cd0faba67b42b5aa0ce5b18a33f0859f404b07/scripts/validate_docstrings.py#L463): [E501](https://duckduckgo.com/?q=pep8%20E501) line too long (80 > 79 characters)
> [Line 487:80](https://github.com/percevalve/pandas/blob/b2cd0faba67b42b5aa0ce5b18a33f0859f404b07/scripts/validate_docstrings.py#L487): [E501](https://duckduckgo.com/?q=pep8%20E501) line too long (83 > 79 characters)
> [Line 497:80](https://github.com/percevalve/pandas/blob/b2cd0faba67b42b5aa0ce5b18a33f0859f404b07/scripts/validate_docstrings.py#L497): [E501](https://duckduckgo.com/?q=pep8%20E501) line too long (88 > 79 characters)
> [Line 606:80](https://github.com/percevalve/pandas/blob/b2cd0faba67b42b5aa0ce5b18a33f0859f404b07/scripts/validate_docstrings.py#L606): [E501](https://duckduckgo.com/?q=pep8%20E501) line too long (81 > 79 characters)
> [Line 659:80](https://github.com/percevalve/pandas/blob/b2cd0faba67b42b5aa0ce5b18a33f0859f404b07/scripts/validate_docstrings.py#L659): [E501](https://duckduckgo.com/?q=pep8%20E501) line too long (81 > 79 characters)


