Modify permissions JSON structure in API documentation

[JonasSupplie]

Updated the JSON structure for granting permissions in the DriveItem API.

the current request example is wrong and will result into error "Property grantedToIdentitiesV2 in payload has a value that does not match schema." or "'grantedTo' must be provided"

Important

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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[learn-build-service-prod]

Learn Build status updates of commit 55810bd:

✅ Validation status: passed

File	Status	Preview URL	Details
api-reference/beta/api/driveitem-post-permissions.md	✅Succeeded

For more details, please refer to the build report.