Improves examples for calendargroup endpoints

[MartinM85]

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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

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Add other supporting information, such as a description of the PR changes:

The PR improves examples by showing the actual values ​​returned by endpoints.

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[learn-build-service-prod]

Learn Build status updates of commit 52e97df:

⚠️ Validation status: warnings

File	Status	Preview URL	Details
api-reference/v1.0/api/calendargroup-list-calendars.md	⚠️Warning		Details
api-reference/beta/api/calendargroup-get.md	✅Succeeded
api-reference/beta/api/calendargroup-list-calendars.md	✅Succeeded
api-reference/beta/api/calendargroup-update.md	✅Succeeded
api-reference/v1.0/api/calendargroup-get.md	✅Succeeded
api-reference/v1.0/api/calendargroup-update.md	✅Succeeded

api-reference/v1.0/api/calendargroup-list-calendars.md

• Line 2, Column 8: [Warning: duplicate-titles - See documentation] Title 'List calendars - Microsoft Graph v1.0' is duplicated in: 'v1.0/api/calendargroup-list-calendars.md(2,8), v1.0/api/user-list-calendars.md(2,8)'. Titles must be unique within a docset.
• Line 11, Column 1: [Warning: duplicate-h1s - See documentation] H1 'List calendars' is duplicated with other articles: 'v1.0/api/calendargroup-list-calendars.md(11,1), v1.0/api/user-list-calendars.md(11,1)'. First level headings must be unique within a docset.

For more details, please refer to the build report.

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