Document that example components were removed, and how to migrate

[bogdandrutu]

Fixes: #2783

[codecov]

Codecov Report

Merging #2793 (0bd0166) into main (49ddca9) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2793   +/-   ##
=======================================
  Coverage   91.71%   91.71%           
=======================================
  Files         293      293           
  Lines       15609    15609           
=======================================
  Hits        14316    14316           
  Misses        887      887           
  Partials      406      406           

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