[chore]fix formating of gen ai docs

[thompson-tomo]

Changes

This ensures that the embed warning alert starts on a new line so that it is rendered correctly.

This issue is already present in the published docs https://opentelemetry.io/docs/specs/semconv/gen-ai/gen-ai-spans/#execute-tool-span within the foot notes section.

As an aside I have raised #3142 to look at alternative options Which would remove the need for the text before the alert but it's hard to see an easy option hence the path here.

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[trask]

This seems fragile, any other options?

[thompson-tomo]

Agree and it didn't end up working due to trimming. If we could add text before the note we would be fine. Hence have asked the gen-ai folks on slack for input.