Docs generation updates. New line replace in help and docstring, chan…

[sfc-gh-astus]

…ged rich markup mode to markdown, added docstring split by headers

Pre-review checklist

• [x] I've confirmed that instructions included in README.md are still correct after my changes in the codebase.
• [ ] I've added or updated automated unit tests to verify correctness of my new code.
• [ ] I've added or updated integration tests to verify correctness of my new code.
• [x] I've confirmed that my changes are working by executing CLI's commands manually on MacOS.
• [ ] I've confirmed that my changes are working by executing CLI's commands manually on Windows.
• [x] I've confirmed that my changes are up-to-date with the target branch.
• [ ] I've described my changes in the release notes.
• [x] I've described my changes in the section below.

Changes description

• Replacing new line in help and docstring
• Changed rich markup mode to markdown
• Splitting docstring by header (##) and adding additional sections at the end of generated file as a comment