improve type annotations in 'docutils.parsers.rst.states'

[danieleades]

No description provided.

[danieleades]

Diff from mypy_primer, showing the effect of this PR on open source code:

sphinx (https://github.com/sphinx-doc/sphinx)
- sphinx/domains/std/__init__.py:388: error: Unused "type: ignore" comment  [unused-ignore]
+ sphinx/directives/__init__.py: note: In member "run" of class "DefaultRole":
+ sphinx/directives/__init__.py:331:26: error: List item 0 has incompatible type "system_message"; expected "SystemMessage"  [list-item]

I have no idea what this means

• sphinx/ext/autodoc/directive.py:118: error: Unused "type: ignore" comment [unused-ignore]
• sphinx/ext/inheritance_diagram.py: note: In member "run" of class "InheritanceDiagram":
• sphinx/ext/inheritance_diagram.py:382:21: error: Item "None" of "Optional[document]" has no attribute "reporter" [union-attr]
• sphinx/ext/inheritance_diagram.py: note: At top level:

bokeh (https://github.com/bokeh/bokeh)

• src/bokeh/sphinxext/bokeh_palette_group.py:53: note: ... from here:
• src/bokeh/sphinxext/bokeh_palette_group.py:53: note: ... from here:

[github-actions]

Diff from mypy_primer, showing the effect of this PR on open source code:

sphinx (https://github.com/sphinx-doc/sphinx)
+ sphinx/directives/__init__.py: note: In member "run" of class "DefaultRole":
+ sphinx/directives/__init__.py:329:26: error: List item 0 has incompatible type "system_message"; expected "SystemMessage"  [list-item]