Update release-notes-tts.md

[garhe]

Update the improved voice list

[prmerger-automator]

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

[learn-build-service-prod]

Learn Build status updates of commit 5450bc6:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/ai-services/speech-service/includes/release-notes/release-notes-tts.md	✅Succeeded

For more details, please refer to the build report.

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[Court72]

@eric-urban

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

[garhe]

Thanks for checking and reviewing

[learn-build-service-prod]

Learn Build status updates of commit daafdf7:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/ai-services/speech-service/includes/release-notes/release-notes-tts.md	✅Succeeded

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

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[v-dirichards]

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