docs: on how to set right cardinality limit

[cijothomas]

Overall doc is still WIP, but adding some more useful information about setting right cardinality limit.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.1%. Comparing base (1f0d9a9) to head (2d8b474).
Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #2998   +/-   ##
=====================================
  Coverage   81.1%   81.1%           
=====================================
  Files        126     126           
  Lines      24954   24954           
=====================================
  Hits       20255   20255           
  Misses      4699    4699           

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[utpilla]

Left some suggestions which could be addressed in another PR as well.