Fix #6589: autodoc: Formatting issues with autodoc_typehints='none'

[tk0miya]

Feature or Bugfix

• Bugfix

Purpose

• refs: Formatting issues with autodoc_typehints='none' #6589

[codecov]

Codecov Report

Merging #6592 into 2.0 will increase coverage by 0.06%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##              2.0    #6592      +/-   ##
==========================================
+ Coverage   83.72%   83.78%   +0.06%     
==========================================
  Files         271      269       -2     
  Lines       40952    40880      -72     
  Branches     5993     5979      -14     
==========================================
- Hits        34288    34253      -35     
+ Misses       5337     5303      -34     
+ Partials     1327     1324       -3

Impacted Files	Coverage Δ
tests/test_ext_autodoc_configs.py	97.56% <ø> (ø)	⬆️
tests/test_util_inspect.py	92.78% <100%> (+0.04%)	⬆️
sphinx/util/inspect.py	72.43% <100%> (ø)	⬆️
sphinx/pycode/parser.py	94.78% <0%> (-0.17%)	⬇️
tests/test_pycode_parser.py	100% <0%> (ø)	⬆️
sphinx/__init__.py
sphinx/make_mode.py
sphinx/ext/imgmath.py	53.39% <0%> (+3.83%)	⬆️

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