[Docs] Add tips on what to use for SSML

[Yard1]

Signed-off-by: Antoni Baum [email protected]

Why are these changes needed?

Adds a tip explaining to users when to use what tool for SSML.

Related issue number

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• [ ] I've run scripts/format.sh to lint the changes in this PR.
• [ ] I've included any doc changes needed for https://docs.ray.io/en/master/.
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• Testing Strategy
  • [ ] Unit tests
  • [ ] Release tests
  • [ ] This PR is not tested :(

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[Yard1]

keep

[richardliaw]

@Yard1 how about let's go with Eric's wording on this, and also make sure each bullet point links to the corresponding example?

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