Better info about batching embeddings API

[howlowck]

It's common for people to search "batch embedding" and be taken to the Batch API docs.
It's better to give some more information to people about embeddings than just saying it's not supported with the Batch API.

[prmerger-automator]

@howlowck : 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 13ab08a:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/ai-services/openai/how-to/batch.md	✅Succeeded

For more details, please refer to the build report.

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[ttorble]

@mrbullwinkle

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

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[ttorble]

I sent email to the content owner today.

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

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[v-dirichards]

I sent a Teams message to the content owner today.

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

[github-actions]

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