Update when-to-use.mdx

[cf-scott]

Noting there is no Observability for Snippets.
I wish our docs had an Observability overview, so I linked it to the Logs overview.

Summary

Screenshots (optional)

Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

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PR Change Summary

Updated the documentation to include an Observability reference for Snippets, linking it to the Logs overview.

• Noted the absence of Observability for Snippets in the documentation.
• Linked the Snippets section to the Logs overview for better clarity.
• Enhanced the documentation to improve user understanding of Observability.

Modified Files

• src/content/docs/rules/snippets/when-to-use.mdx

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