Fixing the rule to update the UPN to a new extension

[brianreidc7]

The originally provided rule did not work. This one does.

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[learn-build-service-prod[bot]]

Learn Build status updates of commit cce4f6f:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
articles/active-directory/hybrid/how-to-connect-sync-change-the-configuration.md	:white_check_mark:Succeeded

For more details, please refer to the build report.

Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

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[American-Dipper]

@billmath - can you review the proposed changes?

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.

#label:"aq-pr-triaged"

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[billmath]

#sign-off

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