docs: Change AWS Cognito Domain tip to warning

[ragul-engg]

Issue

Since it is easy for people to miss this tip in between the examples, I propose to promote this dialog box as a warning.

Description

Updated docs to clearly indicate how to configure the AWS Cognito domain when using its annotation

Checklist

• Added tests that cover your change (if possible)
• Added/modified documentation as required (such as the README.md, or the docs directory)
• Manually tested
• Made sure the title of the PR is a good description that can go into the release notes

BONUS POINTS checklist: complete for good vibes and maybe prizes?! 🤯

• Backfilled missing tests for code in same general area 🎉
• Refactored something and made the world a better place 🌟

[linux-foundation-easycla]

• ✅login: ragul-engg / (80d2916)

The committers listed above are authorized under a signed CLA.

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[k8s-ci-robot]

Hi @ragul-engg. Thanks for your PR.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: ragul-engg
Once this PR has been reviewed and has the lgtm label, please assign zac-nixon for approval. For more information see the Code Review Process.

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[shraddhabang]

Thanks for the PR.

/lgtm
/approved

[ragul-engg]

@shraddhabang can you mark this PR as approved, i think the label wasn't added automatically 😅