add units to /filtering_terms response

[gsfk]

• Add units to /filtering_terms response if they exist in discovery config
• comment typo fix

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.85%. Comparing base (3d45c62) to head (84a4c53).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #126      +/-   ##
==========================================
+ Coverage   69.81%   69.85%   +0.04%     
==========================================
  Files          28       28              
  Lines        1461     1463       +2     
  Branches      166      167       +1     
==========================================
+ Hits         1020     1022       +2     
  Misses        371      371              
  Partials       70       70              

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