Update cross-tenant-sharepoint-migration-step5.md

[joshuc]

Updated the incompatibility note as follows to the correct period or time, and to match the Cross tenant documentation for OneDrive Migrations (https://learn.microsoft.com/en-us/microsoft-365/enterprise/cross-tenant-onedrive-migration-step5). From: "We recommend waiting a period of 24 hours. If your tenants are still reporting as incompatible, contact support."

To: "We recommend waiting a period of 48 hours. If your tenants are still reporting as incompatible, contact support."

[learn-build-service-prod[bot]]

Learn Build status updates of commit 2498a50:

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[learn-build-service-prod[bot]]

Learn Build status updates of commit dc96fd2:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
microsoft-365/enterprise/cross-tenant-sharepoint-migration-step5.md	:white_check_mark:Succeeded

For more details, please refer to the build report.

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• Post your question in the Learn support channel

[yogkumgit]

@JoanneHendrickson Please merge this PR. Thanks