update enums.py

[ARogovskyy]

This updates the present enums (and fixes document-state completed) from the latest definitions, pulled from
https://www.iana.org/assignments/ipp-registrations/ipp-registrations.xhtml

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.69%. Comparing base (62a486a) to head (8716139).
Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #663      +/-   ##
==========================================
+ Coverage   94.39%   94.69%   +0.29%     
==========================================
  Files           9        9              
  Lines         874      923      +49     
  Branches      121      121              
==========================================
+ Hits          825      874      +49     
  Misses         22       22              
  Partials       27       27              

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