Add docstrings to functions, methods, and class in announce.py and contributors.py

[crotodev]

…ors.py

• closes DOC: Docstrings missing from .py files in Sphinxext docs folder #58812
• All code checks passed
• Added docstrings to functions, methods, and classes.

[Aloqeely]

Thanks for the PR! There's already an open PR to fix that issue, so we are going to review that first since it was sent earlier.
Very sorry for wasting your time, you are welcome to contribute to other issues with the Docs label though!