Docs: add instructions for generating support bundle when using a private authenticated registry

[RobertNorthard]

…vate registry which is authenticated

Issue #, if available:
N/A

Description of changes:
Added instructions for generating a support bundle when using a private authenticated registry

Testing (if applicable):
N/A

Documentation added/planned (if applicable):
Added instructions for generating a support bundle when using a private authenticated registr

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[eks-distro-bot]

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[eks-distro-bot]

Hi @RobertNorthard. Thanks for your PR.

I'm waiting for a aws member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.44%. Comparing base (0a9a495) to head (e47fa6c).
Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8069      +/-   ##
==========================================
- Coverage   73.44%   73.44%   -0.01%     
==========================================
  Files         577      577              
  Lines       35878    35878              
==========================================
- Hits        26351    26349       -2     
- Misses       7861     7862       +1     
- Partials     1666     1667       +1     

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