Add new ARM64 feature arguments to documentation

[Vít Knobloch (vitknobloch)]

Add new extensions cssc and faminmax to the /feature flag arguments documentation

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

[prmerger-automator]

Vít Knobloch (@vitknobloch) : 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 a8a35ef:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/build/reference/feature-arm64.md	✅Succeeded

For more details, please refer to the build report.

[Regan Downer (v-regandowner)]

Tyler Whitney (@TylerMSFT)

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

[Tyler Whitney (TylerMSFT)]

#sign-off

[Copilot]

Pull request overview

Adds documentation coverage for newly supported ARM64 /feature arguments so developers can discover and use the new architecture extensions via MSVC compiler flags.

Changes:

• Documented the new /feature arguments cssc (FEAT_CSSC) and faminmax (FEAT_FAMINMAX) in the ARM64 feature table.

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