hint processor doc

[franciscoidalgo]

More documentation for HintProcessor trait

Description

Adds documentation about HintProcessor trait and its implementation. Closes #437

Checklist

• [x] Linked to Github Issue
• [ ] Unit tests added
• [ ] Integration tests added.
• [ ] This change requires new documentation.
  • [ ] Documentation has been added/updated.

[codecov-commenter]

Codecov Report

Merging #440 (647637c) into main (42bca5f) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #440   +/-   ##
=======================================
  Coverage   96.66%   96.66%           
=======================================
  Files          54       54           
  Lines        9124     9124           
=======================================
  Hits         8820     8820           
  Misses        304      304           

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