Change maximum delivery latency for driveItem and list

[chackman]

Updated delivery latency for driveItem and list to reflect unknown values.

Important

Use the AI-powered workflow for Graph onboarding to author and self-review schema-related changes. See https://aka.ms/msgraphcdk for more information.

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:

There is no set maximum delivery latency; the average latency is unchanged.

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[learn-build-service-prod]

Learn Build status updates of commit 4986ce0:

✅ Validation status: passed

File	Status	Preview URL	Details
concepts/includes/change-notifications-delivery-latency.md	✅Succeeded

For more details, please refer to the build report.

[chackman]

I will update this and create a new PR.