[Enhancement] - PyDocstyle Compliant

[IgorWounds]

Pull Request Template for OpenBB Developers

1. Why? (1-3 sentences or a bullet point list):

   • To ensure the quality of code we want to comply with PyDocstyle.

2. What? (1-3 sentences or a bullet point list):

   • Fixes and adds docstrings where needed to comply with PyDocstyle.
   • To ensure we follow PyDocstyle, it is added to the linters that run on each PR on changed files.

3. Impact (1-2 sentences or a bullet point list):

   • Touched many files and changed their signatures. It shouldn't create breaking changes.

4. Testing Done:

   • Made sure that te PyDocstyle check passes.