Update ddsv6-series removing Preview from the title

[hkamel]

Based on this table, the series is production now https://learn.microsoft.com/en-us/azure/azure-boost/overview

[prmerger-automator]

@hkamel : 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 ab3d2f6:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/virtual-machines/sizes/general-purpose/ddsv6-series.md	✅Succeeded

For more details, please refer to the build report.

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[ttorble]

@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

[apjanke]

Looks like its sibling pages for the Dsv6, Dlsv6, and Dldsv6 series also still say "(Preview)" but are in production now too?

And there's no entries for these Dsv6 and friends series in the D family > Overview page to go with them? (Just the "a" and "p" variants for AMD and Cobalt CPU sizes.)

[apjanke]

It also seems like there's a D192ds v6 size that exists, but isn't listed on this page. Is this repo the right place to ask about that?

Forum post: https://feedback.azure.com/d365community/idea/c8f5bd52-d722-f011-9d48-7c1e52b9d984

[v-dirichards]

@mattmcinnes Could you respond to the comments above?