Update how-to-manage-azure-ad-users.md

[hkusulja]

Update on docs for 2025 and new version

Reference - https://learn.microsoft.com/en-us/answers/questions/1654133/azure-postgresql-flexible-server-unable-to-drop-ro

https://www.postgresql.org/docs/16/release-16.html

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[v-dirichards]

@achudnovskij

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"
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[rothja]

#assign:@markingmyname

[v-dirichards]

@markingmyname

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

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. If the changes no longer apply, add an explanation and a #please-close comment to close the PR.

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[markingmyname]

@markingmyname