docs(toolset): add YAML serialization examples

[MukundaKatta]

Summary

• docs(toolset): add YAML serialization examples

Changed files

• docs-website/docs/tools/toolset.mdx

Tests

• Not run in this publishing pass.

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[vercel]

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[julian-risch]

Hi @MukundaKatta Thank you for opening this PR! We haven't decided yet if we want to bring YAML examples to all documentation pages. Is that something you would benefit from yourself or how did you get the idea to open this PR? In any case, if you would like to contribute to Haystack, we need you to agree to the CLA please: #11317 (comment)