DM-48395: Document newly added support for Mermaid graphs

[enourbakhsh]

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.31%. Comparing base (704effe) to head (de77370).
Report is 3 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #462   +/-   ##
=======================================
  Coverage   82.31%   82.31%           
=======================================
  Files         107      107           
  Lines       12702    12702           
  Branches     1628     1628           
=======================================
  Hits        10456    10456           
  Misses       1813     1813           
  Partials      433      433           

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