Revert "Re-land "[lldb/docs] Silence warnings when generating website""

This reverts 3 commit:
- f0731d5b.
- 8e0a0875.
- f2f5d6fb.

This changes were introduced to silence the warnings that are printed
when generating the lldb module documentation for the website but it
changed the python bindings and causes test failures on the macos bot:

https://green.lab.llvm.org/green/job/lldb-cmake/59438/

We will have to consider other options to silence these warnings.