Update manage-data-gcc.md

[alexsfaulkner]

Added line about comments not being included in ediscovery.

[learn-build-service-prod]

Learn Build status updates of commit 80f1252:

💡 Validation status: suggestions

File	Status	Preview URL	Details
microsoft-365/whiteboard/manage-data-gcc.md	💡Suggestion		Details

microsoft-365/whiteboard/manage-data-gcc.md

• Line 15, Column 14: [Suggestion: duplicate-descriptions - See documentation] Attribute 'description' with value 'Learn how to enable, disable, and manage access to Whiteboard.' is duplicated in 'whiteboard/manage-data-gcc-high.md(15,14)', 'whiteboard/manage-data-gcc.md(15,14)'.

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[v-jmathew]

As per the response from submitter, they no longer work on Whiteboard so unfortunately, they cannot answer this.