Update overview.md

[DMoenks]

Removed a mostly duplicate section with very similar wording and added a reference for assigning Graph permissions to a managed identity

[prmerger-automator]

@DMoenks : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change.

[learn-build-service-prod]

Learn Build status updates of commit da7570b:

💡 Validation status: suggestions

File	Status	Preview URL	Details
docs/identity/managed-identities-azure-resources/overview.md	💡Suggestion		Details

docs/identity/managed-identities-azure-resources/overview.md

• Line 101, Column 194: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://learn.microsoft.com/graph/api/serviceprincipal-post-approleassignedto' will be broken in isolated environments. Replace with a relative link.

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[learn-build-service-prod]

Learn Build status updates of commit 854f7dd:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/identity/managed-identities-azure-resources/overview.md	✅Succeeded

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For any questions, please:

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[v-dirichards]

@SHERMANOUKO

Can you review the proposed changes?

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team