Docs: Text to sql example - minor naming / dedupe

[GrahamTheCoder]

1. Fix name to waiters for second table
2. Remove incorrect comment
3. Dedupe insert row logic - it's not central to the example so shouldn't be repeated

Thanks for the library, it looks great so far.

If not useful, happy to iterate, or feel free to close the PR and fix this up a different way

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

[albertvillanova]

Thank you. Just some minor comments.

[GrahamTheCoder]

Thanks, I've applied those improvements
Test failed due to a "429: Too many requests" so I assume that's not related to the PR changes

[albertvillanova]

Thanks.
Yes, CI error is unrelated.