Update redhat-images.md

[arunkp89]

Added a note on how to update OS connected to E4S repos.

[prmerger-automator[bot]]

@arunkp89 : Thanks for your contribution! The author(s) have been notified to review your proposed change. @asinn826

[opbld32]

Learn Build status updates of commit 5ebbc8c:

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[Court72]

@mathapli

Can you review the proposed changes? IMPORTANT: When the changes are ready for publication, add a #sign-off comment to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged" @MicrosoftDocs/public-repo-pr-review-team

[cynthn]

#sign-off - will send mail asking for exception

[prmerger-automator[bot]]

Invalid command: '#sign-off'. Only the assigned author of one or more file in this PR can sign off. @asinn826