docs: add note about read-only group calendar container properties

[mashokMicrosoft]

Summary

• Added an [!IMPORTANT] callout in the Request body section of calendar-update.md to clarify that calendar container properties in group calendars are read-only.
• PATCH requests targeting these properties return 405 Method Not Allowed.

Test plan

• Verify the callout renders correctly in the docs preview.
• Confirm placement is after the request body property table and before the Response section.

🤖 Generated with Claude Code

[learn-build-service-prod]

Learn Build status updates of commit 7eb7a0f:

✅ Validation status: passed

File	Status	Preview URL	Details
api-reference/v1.0/api/calendar-update.md	✅Succeeded

For more details, please refer to the build report.

[learn-build-service-prod]

Learn Build status updates of commit 7eb7a0f:

✅ Validation status: passed

File	Status	Preview URL	Details
api-reference/v1.0/api/calendar-update.md	✅Succeeded

For more details, please refer to the build report.

[Copilot]

Pull request overview

Adds a new warning to the calendar update API docs to clarify group-calendar update behavior for calendar container properties in both v1.0 and beta. This fits the Outlook/Graph reference set by documenting a group-specific API constraint on an existing PATCH method.

Changes:

• Added an [!IMPORTANT] callout to the v1.0 calendar-update topic.
• Added the same [!IMPORTANT] callout to the beta calendar-update topic.
• Documented that certain PATCH requests against group calendar container properties return 405 Method Not Allowed.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
api-reference/v1.0/api/calendar-update.md	Adds the new group-calendar warning to the v1.0 update method doc.
api-reference/beta/api/calendar-update.md	Adds the same warning to the beta update method doc.

[learn-build-service-prod]

Learn Build status updates of commit 1df5a0d:

✅ Validation status: passed

File	Status	Preview URL	Details
api-reference/v1.0/api/calendar-update.md	✅Succeeded

For more details, please refer to the build report.

[learn-build-service-prod]

Learn Build status updates of commit 1d50f66:

✅ Validation status: passed

File	Status	Preview URL	Details
api-reference/beta/api/calendar-update.md	✅Succeeded
api-reference/v1.0/api/calendar-update.md	✅Succeeded

For more details, please refer to the build report.

[Danipocket]

@mashokMicrosoft, please do the CL agreement as indicated above.

[mashokMicrosoft]

@microsoft-github-policy-service agree company="Microsoft"