Fix typos in a docstring

[atugushev]

• Target the master branch for bug fixes, documentation updates and trivial changes.
• Target the features branch for new features and removals/deprecations.
• Include documentation when adding new features.
• Include new tests or update existing tests when applicable.

Unless your change is trivial or a small documentation fix (e.g., a typo or reword of a small section) please:

• Create a new changelog file in the changelog folder, with a name like <ISSUE NUMBER>.<TYPE>.rst. See changelog/README.rst for details.
• Add yourself to AUTHORS in alphabetical order;

[atugushev]

Sorry, forgot to skip ci :(

[codecov]

Codecov Report

Merging #5598 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #5598   +/-   ##
=======================================
  Coverage   96.11%   96.11%           
=======================================
  Files         117      117           
  Lines       25775    25775           
  Branches     2495     2495           
=======================================
  Hits        24773    24773           
  Misses        697      697           
  Partials      305      305

Impacted Files	Coverage Δ
src/_pytest/pathlib.py	87.89% <ø> (ø)	⬆️

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[nicoddemus]

Thanks @atugushev, appreciate it. 👍