unify args and attributes docstrings in Chat class

[HatimZ]

Refer to #3109, Chat class arguments docstrings and attributes docstrings are unified.

Checklist for PRs

• Added .. versionadded:: version, .. versionchanged:: version or .. deprecated:: version to the docstrings for user facing changes (for methods/class descriptions, arguments and attributes)
• Created new or adapted existing unit tests
• Documented code changes according to the CSI standard
• Added myself alphabetically to AUTHORS.rst (optional)
• Added new classes & modules to the docs and all suitable __all__ s

[Bibo-Joshi]

Hi. Thanks for the PR! The changes themself look good, but unfortunately, there are some trailing whitespaces. See the pre-commit output for details. Please also check out the contribution guide for details on how to set up the pre-commit hooks locally.

[HatimZ]

@Bibo-Joshi Hi . I have removed the trailing whitespaces. I hope its good now. Thanks!

[Bibo-Joshi]

Thank you for the contribution! :)