Empty lines at the end of a docstring are not allowed on Numpydoc

Empty lines at the end of a docstring are not allowed on Numpydoc

For instance this docstring:

```py
def my_func() -> str:
"""This is a function.

Returns
-------
str
A greeting message.

Notes
-----
**The next line should not be empty nor exist.**

"""
return "Hello"
```

Because of [GL02](https://dokk.org/documentation/numpydoc/v1.4.0/validation/#built-in-validation-checks)

Start by tracing where the converter generates Python docstrings from XML documentation, then reproduce the example in the issue and compare it with Numpydoc's GL02 requirement. Done means generated docstrings no longer contain the forbidden empty line at the end of the section, with a regression check for the shown case.

Written by the indexing model from the issue text.