Update restorepoint.md to include 'includeNewerItems' description

[Subham-RKB]

Added description for 'includeNewerItems' member in restore point.

Important

Required for API changes:

• [] Link to API.md file: https://msazure.visualstudio.com/One/_git/AD-AggregatorService-Workloads?path=/Reviews/EnD/14425970-41475-Add-new-member-for-Restore-Point-Tags/API.md&version=GCb9b9a90f5c9ee85055fb54e3bf96f86e9df09f98&_a=preview
• [] Link to PR for public-facing schema changes (schema-Prod-beta/v1.0.csdl): ADD LINK HERE
• [] OPTIONAL: Attach the documentation plan generated for AI-assisted docs authoring and validation to help speed up content review.

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

ADD INFORMATION HERE

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[learn-build-service-prod]

Learn Build status updates of commit 04986bc:

✅ Validation status: passed

File	Status	Preview URL	Details
api-reference/beta/resources/restorepoint.md	✅Succeeded

For more details, please refer to the build report.

[Danipocket]

@Subham-RKB, please create this PR on the private repo. Thanks!

[FaithOmbongi]

As part of queue cleanup, I'll close this PR. Please see Dani's suggestion above to open the PR in the private repo.