Update mdm-supported-devices.md

[msbemba]

trafficstars

Updated the Note to reflect IOS 15.X

Fixes https://github.com/MicrosoftDocs/memdocs-pr/issues/12976

[prmerger-automator[bot]]

@msbemba : Thanks for your contribution! The author(s) have been notified to review your proposed change.

[msbemba]

@JohanFreelancer9 Please copy review

@yogkumgit The author for the docment is @ErikjeMS

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[yogkumgit]

@ErikjeMS Please review and signoff this PR. Thanks

[ErikjeMS]

#sign-off