Fix incorrect active vCPU counts for E_v6 constrained-core VMs in documentation

[travishankins]

Corrected the active vCPU values for constrained-core Standard_E_v6 SKUs (e.g., Standard_E32-8s_v6, Standard_E64-16s_v6, etc.).

Previous documentation incorrectly listed the base vCPUs instead of the reduced active vCPUs as indicated by the SKU naming convention.

This update aligns the E_v6 SKU active vCPU counts with actual Azure deployment behavior, improving sizing, licensing, and planning accuracy.

[travishankins]

@microsoft-github-policy-service agree company="Microsoft"

[prmerger-automator]

@travishankins : 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 b417e9f:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/virtual-machines/constrained-vcpu.md	✅Succeeded

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[v-regandowner]

@mattmcinnes - 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

[github-actions]

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[v-dirichards]

@mattmcinnes Could you review this proposed update to your article and enter #sign-off in a comment if it's ready to merge?

Thanks!

[v-dirichards]

I sent an email to the content owner today.

@MicrosoftDocs/public-repo-pr-review-team