Synchronize stub file docstrings with original docstrings

[Armavica]

While Jedi finds docstrings at runtime, Pylance extracts them statically, which does not work for docstrings provided in the Rust code. This is why we copied docstrings to the type stub file (#34), but they might come out of sync with the rust docstrings.
We could either wait that Pylance is able to find these docstrings, use a script to autogenerate the stub file with docstrings, or move the docstrings to the Python side of the bindings.