Fix #4769: autodoc loses the first staticmethod parameter

[tk0miya]

Feature or Bugfix

• Bugfix

Purpose

• see autodoc loses the first staticmethod parameter #4769

[codecov]

Codecov Report

Merging #4774 into 1.7 will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##              1.7    #4774      +/-   ##
==========================================
+ Coverage   81.85%   81.86%   +<.01%     
==========================================
  Files         279      279              
  Lines       37391    37393       +2     
  Branches     5817     5818       +1     
==========================================
+ Hits        30608    30610       +2     
  Misses       5477     5477              
  Partials     1306     1306

Impacted Files	Coverage Δ
tests/test_autodoc.py	96.28% <ø> (ø)	⬆️
sphinx/ext/autodoc/__init__.py	85.18% <100%> (+0.03%)	⬆️
sphinx/builders/html.py	82.54% <0%> (-0.12%)	⬇️
sphinx/util/inspect.py	72.98% <0%> (+0.23%)	⬆️

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