Numpy & ReST docstrings: Remove/Ignore "optional" as types #99
Description
Is your feature request related to a problem?
Currently if class attributes in Numpy or parameters in ReST have "optional" as a type, the "optional" will be parsed as a possible type.
Desired solution
Create a PR in Griffe to filter "optional".
Additional Context (optional)
More information can be found on the fourth point of this question: mkdocstrings/griffe#258