Document typedefs

[mborland]

Closes: #834

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.9%. Comparing base (13c9083) to head (c6e5754).
Report is 25 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop    #862     +/-   ##
=========================================
+ Coverage     98.8%   98.9%   +0.1%     
=========================================
  Files          232     232             
  Lines        16827   16827             
  Branches      1813    1813             
=========================================
+ Hits         16625   16626      +1     
+ Misses         202     201      -1     

see 1 file with indirect coverage changes

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