Fixning-Doc-Typos
Docs: changes the documentation

Fix docs typos and small grammatical  update 

Hi @mohamed-khoualed - instead of repeatedly (cf #39933) opening PRs which introduce new grammatical errors, why not try tackling on of the many [good first issue](https://github.com/pandas-dev/pandas/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22)s? See [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html) for how to contribute, and feel free to reach out on Gitter if you have trouble getting set up

I promise it'll be a more rewarding experience for you :+1: