Fix endpoint path for calendar permanent delete

[naiyaarora1016]

Fixing the issue in documentation. Issue raised by Loc Le, Tarun Chopra, Sudhamsu Mylavarapu. calendar-permanentDelete endpoint path (missing 's' in calendars)

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Required for API changes:

• [] Link to API.md file: ADD LINK HERE
• [] Link to PR for public-facing schema changes (schema-Prod-beta/v1.0.csdl): ADD LINK HERE
• [] Attach the documentation plan generated for AI-assisted docs authoring and validation to help speed up content review.

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[naiyaarora1016]

Kindly review and approve the PR.

[learn-build-service-prod]

Learn Build status updates of commit 53e6656:

✅ Validation status: passed

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

For more details, please refer to the build report.

[naiyaarora1016]

Re_ Possible documentation issue_ calendar-permanentDelete endpoint path (missing 's' in calendars).eml

Attaching the complete email thread, which is related to updating the endpoint. Engineer has verified the change with correct endpoint.
This email thread is about a documentation bug in the Microsoft Graph API and the urgency to fix it due to EU compliance requirements.

[learn-build-service-prod]

Learn Build status updates of commit b9d2135:

✅ Validation status: passed

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

For more details, please refer to the build report.

[learn-build-service-prod]

Learn Build status updates of commit 2383ce4:

✅ Validation status: passed

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

For more details, please refer to the build report.