Adding the generic autodiscover URI to the list

[brianreidc7]

I had a client who did not use the autodiscover.domain.com value internally as the article here says to add your internal domains - but now that Basic Auth has been switched off for AutoDiscover, you need the autodiscover.contoso.com value added as well or you get a sign-in error when Outlook tries to do AutoDiscover. So you need to include you internal and external domains which includes AutoDiscover, so added something to here to call this out more clearly

[learn-build-service-prod]

Learn Build status updates of commit 0ed2d27:

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microsoft-365/enterprise/configure-exchange-server-for-hybrid-modern-authentication.md	✅Succeeded

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[yogkumgit]

@kelleyvice-msft Please merge this PR. Thanks

[yogkumgit]

@kelleyvice-msft Gentle reminder

[learn-build-service-prod]

Learn Build status updates of commit 67a3f6d:

✅ Validation status: passed

File	Status	Preview URL	Details
microsoft-365/enterprise/configure-exchange-server-for-hybrid-modern-authentication.md	✅Succeeded

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