Update azure-ad-authentication.md

[SeanGreenbaum]

Included note for URL for US Government cloud for application insights endpoint

[learn-build-service-prod]

Learn Build status updates of commit 7cc47f0:

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articles/azure-monitor/app/azure-ad-authentication.md	✅Succeeded

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[v-regandowner]

@rishabjolly - Can you review the proposed changes?

IMPORTANT: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

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

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[v-dirichards]

@rishabjolly Could you review this proposed update to your article and enter #sign-off in a comment if it's ready to merge?

Thanks!

[v-dirichards]

@rishabjolly

Can you review this old PR and determine whether it needs to be closed or merged?

@MicrosoftDocs/public-repo-pr-review-team

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[v-dirichards]

I sent a Teams message to the content owner today.

@MicrosoftDocs/public-repo-pr-review-team

[v-dirichards]

I sent an email to the content owner today.

@MicrosoftDocs/public-repo-pr-review-team

[github-actions]

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