Update overview.md

[AlecFernandez]

SEV-SNP CVMs are now GA and also offer encryption of data while in use

[prmerger-automator[bot]]

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

[opbld32]

Learn Build status updates of commit 1a91d7d:

:white_check_mark: Validation status: passed

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articles/attestation/overview.md	:white_check_mark:Succeeded

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[jborsecnik]

@msmbaldwin,

Can you review the proposed changes?

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

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

[msmbaldwin]

#sign-off

[prmerger-automator[bot]]

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

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

Learn Build status updates of commit 677cd2c:

:x: Validation status: errors

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	:x:Error		Details

• [Error: GitBranchDeletedOrForcePushed]

Cannot sync git repo to specified commit because ref +refs/pull/102811/merge has been deleted or has been force pushed.
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