Add usage doc comment for AnyValue type

[lalitb]

Fixes #
Design discussion issue (if applicable) #

Changes

Please provide a brief description of the changes here.

Merge requirement checklist

• CONTRIBUTING guidelines followed
• Unit tests added/updated (if applicable)
• Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.4%. Comparing base (845cf21) to head (c44ce60).
Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #2293   +/-   ##
=====================================
  Coverage   79.4%   79.4%           
=====================================
  Files        122     122           
  Lines      20783   20783           
=====================================
  Hits       16506   16506           
  Misses      4277    4277           

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