Update manage-access-agents-in-sharepoint.md

[rohit404404]

Explicitly mentioned tha clause about having access to the knwldge base. Mere having access to .agent file doesnt guarantee that agent will provide the results . (Thats my understanding )

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[learn-build-service-prod]

Learn Build status updates of commit 277d53e:

✅ Validation status: passed

File	Status	Preview URL	Details
SharePoint/SharePointOnline/manage-access-agents-in-sharepoint.md	✅Succeeded

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel