payg docs updated

[DevOpsStyle]

Hello Team, updated the documentation about the PAYG model in case the option is greyed out.

[prmerger-automator]

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

[prmerger-automator]

@DevOpsStyle : 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 82f8719:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/sql-server/azure-arc/manage-license-billing.md	✅Succeeded

For more details, please refer to the build report.

[DevOpsStyle]

#sign-off

[prmerger-automator]

Invalid command: '#sign-off'. Only the assigned author of one or more file in this PR can sign off. @pochiraju

[v-regandowner]

@pochiraju

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

[MashaMSFT]

Hi @DevOpsStyle , thanks for your submission! We ask that internal contributors use the private repository. Instead of adding a link to this blog, we're going to migrate the content of the blog directly to docs. I'm tracking that work separately, so will close out this PR.

Thanks again for your contribution!

Masha from the SQL Docs team