update image-builder docs

[tatlat]

Issue #, if available:

Description of changes:

Testing (if applicable):

Documentation added/planned (if applicable):

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[eks-distro-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please ask for approval from tatlat. For more information see the Kubernetes Code Review Process.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• docs/OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[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 131 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           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[mitalipaygude]

Can we add description details on this PR?