Update proxy-intro-aad.md

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[AmitMishaeli]

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

[AmitMishaeli]

sign-off

[prmerger-automator[bot]]

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

[AmitMishaeli]

sign-off

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

[Court72]

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Thanks for approving the PR. Note that in the public repos, PRMerger requires the article's author to sign off.