DM-38953: Fix typos.

[TallJimbo]

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (991ed79) 85.18% compared to head (9c32086) 85.18%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #99   +/-   ##
=======================================
  Coverage   85.18%   85.18%           
=======================================
  Files          46       46           
  Lines        3612     3612           
=======================================
  Hits         3077     3077           
  Misses        535      535           

Impacted Files	Coverage Δ
python/lsst/pex/config/config.py	90.39% <ø> (ø)

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