Update doc about MTR

[hedwig233]

MTR team had rolled out the ability for users to start/stop recording directly from MTR. Update the content about MTR in this PR

[learn-build-service-prod]

Learn Build status updates of commit 87d3471:

✅ Validation status: passed

File	Status	Preview URL	Details
Teams/tmr-meeting-recording-change.md	✅Succeeded

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[learn-build-service-prod]

Learn Build status updates of commit da2ac35:

✅ Validation status: passed

File	Status	Preview URL	Details
Teams/tmr-meeting-recording-change.md	✅Succeeded

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[learn-build-service-prod]

Learn Build status updates of commit a4a40e4:

✅ Validation status: passed

File	Status	Preview URL	Details
Teams/tmr-meeting-recording-change.md	✅Succeeded

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[learn-build-service-prod]

Learn Build status updates of commit 7a01143:

✅ Validation status: passed

File	Status	Preview URL	Details
Teams/tmr-meeting-recording-change.md	✅Succeeded

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel