update image-builder docs

[tatlat]

Issue #, if available:

Description of changes:

Testing (if applicable):

Documentation added/planned (if applicable):

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.52%. Comparing base (69f4827) to head (e31e1bf).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8552   +/-   ##
=======================================
  Coverage   73.52%   73.52%           
=======================================
  Files         578      578           
  Lines       36549    36549           
=======================================
  Hits        26873    26873           
  Misses       7955     7955           
  Partials     1721     1721           

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[mitalipaygude]

Can we add description details on this PR?