consistent doc header formatting

[jfdev001]

Partially address #1156

• Conversion of title case in documentation to sentence case.
• POTENTIAL TODO: Does not modify pre-commit pipeline to enforce this sentence naming convention in future commits. I could extend the PR to include enforcing this formatting, but did not do this in the current PR.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.75%. Comparing base (b03a6fe) to head (1329984).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1175   +/-   ##
=======================================
  Coverage   93.75%   93.75%           
=======================================
  Files          39       39           
  Lines        6241     6241           
=======================================
  Hits         5851     5851           
  Misses        390      390           

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