Document that changing pcommon.Map invalidates Value references

[bogdandrutu]

Fixes #13073

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.51%. Comparing base (e2954b9) to head (6a0d1ac).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #13341   +/-   ##
=======================================
  Coverage   91.51%   91.51%           
=======================================
  Files         526      526           
  Lines       29456    29456           
=======================================
  Hits        26957    26957           
  Misses       1970     1970           
  Partials      529      529           

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