Update cache.rst

[curiousjazz77]

• [x ] Target the master branch for bug fixes, documentation updates and trivial changes.

[codecov]

Codecov Report

Merging #5465 into master will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5465      +/-   ##
==========================================
- Coverage   96.03%   96.01%   -0.03%     
==========================================
  Files         115      115              
  Lines       25512    25512              
  Branches     2480     2480              
==========================================
- Hits        24501    24495       -6     
- Misses        706      712       +6     
  Partials      305      305

Impacted Files	Coverage Δ
src/_pytest/capture.py	93.42% <0%> (-1.32%)	⬇️

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[nicoddemus]

Thanks, appreciate it! 🙇