Fix #6196: py domain: unexpected prefix is generated

[tk0miya]

Feature or Bugfix

• Bugfix

Purpose

• refs: python domain generates unexpected prefix #6196

[codecov]

Codecov Report

Merging #6198 into 2.0 will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##              2.0    #6198      +/-   ##
==========================================
+ Coverage   83.54%   83.55%   +<.01%     
==========================================
  Files         272      272              
  Lines       39343    39349       +6     
  Branches     5867     5867              
==========================================
+ Hits        32870    32878       +8     
+ Misses       5125     5124       -1     
+ Partials     1348     1347       -1

Impacted Files	Coverage Δ
sphinx/domains/python.py	78.65% <100%> (+0.4%)	⬆️
tests/test_domain_py.py	98.8% <100%> (+0.04%)	⬆️

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