changed description of Parse_dates in Read_excel
- [ ] closes #29217 
- [ ] tests added / passed
- [ ] passes `black pandas`
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

Hello @alexander135! Thanks for opening this PR. We checked the lines you've touched for [PEP 8](https://www.python.org/dev/peps/pep-0008) issues, and found:

* In the file [`pandas/io/excel/_base.py`](https://github.com/pandas-dev/pandas/blob/e87bd10397d3335b3cb5550b18a4404febf2ab65/pandas/io/excel/_base.py):

> [Line 169:89](https://github.com/pandas-dev/pandas/blob/e87bd10397d3335b3cb5550b18a4404febf2ab65/pandas/io/excel/_base.py#L169): [E501](https://duckduckgo.com/?q=pep8%20E501) line too long (91 > 88 characters)

