Add an extended Snippet for Advanced Functions fixes #5197

[kilasuit]

PR Summary

fixes #5197

Added snippet from ISE with minor edits

• comment help inside instead of outside the function defintion
• added clean block and link to docs on this

Adding based on this comment on bsky

PR Checklist

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[kilasuit]

@JustinGrote this was a C&P from the one in ISE with very minor edits But will take comments on board and push an update shortly

[JustinGrote]

I'll merge it either way, but good to make it as useful as possible yeah?

[JustinGrote]

@andyleejordan not sure why it's waiting on codeql, I don't see it as an action...

[JustinGrote]

@andyleejordan bump on this.

[JustinGrote]

Thanks @kilasuit!