[lldb] [NFC] Fix swig docstring annotations (#88073)

Some of the SB API method description docstrings for swing are annotated
as `%feature("autodoc")` - but `"autodoc"` annotations are only to
substitute a string showing the arguments and return variables - either
in a single line, or in multiple lines. SBMemoryRegionInfo used
`"autodoc"` correctly describing the parameters and return type, but
then it added a description too which is not correct either.

Change all of these that are adding a method description to use
`%feature("docstring")` instead. There were a half dozen instances where
`"autodoc"` was correctly being used and we have overriden the parameter
and return types with a more readable version.

GitOrigin-RevId: e35fb3fb8bfcb732ace3738f9589989b3fac1508
4 files changed