[CLIENT-4306] Increase Sphinx linkcheck retry count to 4 to prevent false positives

[juliannguyen4]

TODO

• If works, document why we have this setting in conf.py

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.53%. Comparing base (506f4d9) to head (5de93f0).
⚠️ Report is 3 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #989   +/-   ##
=======================================
  Coverage   83.53%   83.53%           
=======================================
  Files          99       99           
  Lines       14392    14392           
=======================================
  Hits        12022    12022           
  Misses       2370     2370           

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