A number of documentation updates. No new release.

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Codecov Report

Merging #904 (52ea915) into master (65519ce) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #904   +/-   ##
=======================================
  Coverage   42.85%   42.85%           
=======================================
  Files           1        1           
  Lines          28       28           
=======================================
  Hits           12       12           
  Misses         16       16           

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