Close #6325: autodoc: Support attributes in __slots__

[tk0miya]

Feature or Bugfix

• Feature

Purpose

• refs: Allow for slots to be documented in the 3.8 mentioned dictionary style #6325 , Behavior when documenting a __slots__ attribute is unexpected #4678

[codecov]

Codecov Report

Merging #6388 into 2.0 will decrease coverage by 0.02%.
The diff coverage is 88.37%.

@@            Coverage Diff             @@
##              2.0    #6388      +/-   ##
==========================================
- Coverage   83.64%   83.62%   -0.03%     
==========================================
  Files         279      282       +3     
  Lines       40317    40393      +76     
  Branches     5939     5945       +6     
==========================================
+ Hits        33725    33779      +54     
- Misses       5263     5282      +19     
- Partials     1329     1332       +3

Impacted Files	Coverage Δ
tests/test_autodoc.py	96.92% <100%> (+0.02%)	⬆️
sphinx/ext/autodoc/importer.py	94.73% <100%> (+0.23%)	⬆️
tests/roots/test-ext-autodoc/target/slots.py	83.33% <83.33%> (ø)
sphinx/ext/autodoc/__init__.py	88.78% <85.71%> (-0.12%)	⬇️
sphinx/__init__.py	73.91% <0%> (ø)
sphinx/make_mode.py	0% <0%> (ø)

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