Fix #3859: manpage: code-block captions are not displayed correctly

[tk0miya]

Feature or Bugfix

• Bugfix

Purpose

• refs: code-block captions are not displayed correctly in man pages #3859

[codecov]

Codecov Report

Merging #6159 into 1.8 will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##              1.8    #6159      +/-   ##
==========================================
+ Coverage   82.25%   82.26%   +<.01%     
==========================================
  Files         302      308       +6     
  Lines       40351    40702     +351     
  Branches     6233     6289      +56     
==========================================
+ Hits        33191    33483     +292     
- Misses       5779     5832      +53     
- Partials     1381     1387       +6

Impacted Files	Coverage Δ
tests/test_build_manpage.py	100% <100%> (ø)	⬆️
sphinx/writers/manpage.py	90.62% <100%> (+0.26%)	⬆️
sphinx/make_mode.py	0% <0%> (ø)
sphinx/search/__init__.py	96.9% <0%> (ø)
sphinx/quickstart.py	0% <0%> (ø)
sphinx/errors.py	80% <0%> (ø)
sphinx/__init__.py	60% <0%> (ø)
sphinx/apidoc.py	0% <0%> (ø)
sphinx/builders/html.py	82.95% <0%> (+0.09%)	⬆️

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