remove %s formatting from docs

[verhovsky]

No description provided.

[codecov]

Codecov Report

Merging #5733 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5733      +/-   ##
==========================================
- Coverage   96.17%   96.16%   -0.01%     
==========================================
  Files         117      117              
  Lines       25864    25864              
  Branches     2498     2498              
==========================================
- Hits        24875    24873       -2     
- Misses        689      690       +1     
- Partials      300      301       +1

Impacted Files	Coverage Δ
src/_pytest/pastebin.py	87.71% <0%> (-3.51%)	⬇️

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