Clarify behavior when both FSC.Manage.All and FSC.Selected are granted for admin and nonadmin

[lilealdai]

Category

• Content fix
• New article

What's in this Pull Request?

• Introduce FileStorageContainer.Manage.All alongside FileStorageContainer.Selected as the two supported Microsoft Graph permissions for delegated access.
• Added a table describing how effective access varies based on the permissions granted to the application and whether
  the user is an administrator.

[learn-build-service-prod]

Learn Build status updates of commit 3664737:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/embedded/development/auth.md	✅Succeeded	View

For more details, please refer to the build report.

[learn-build-service-prod]

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