Add auto glossary for DG

[Eugenetanwl3881]

• Added auto glossary for terms in DG where relevant
• Removed unnecessary/unused glossary terms from DG
• Added new glossary term in DG
• Fixed errors found along the way when updating the DG

Closes #499 (UG auto glossary PR is #515)

[codecov-commenter]

Codecov Report

Merging #521 (cee0f22) into master (8668109) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #521   +/-   ##
=========================================
  Coverage     65.25%   65.25%           
  Complexity      737      737           
=========================================
  Files           147      147           
  Lines          2590     2590           
  Branches        282      282           
=========================================
  Hits           1690     1690           
  Misses          749      749           
  Partials        151      151           

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