docs: Note File Type in Snippet Guide

[acudworth3]

📑 Description

Small update to the guide on creating snippets.

• note that a vue file must have a .vue extension. Seems a little silly but I wasted 5-10 min before realizing it.

ℹ Additional Information

Feel free to reject if you think it is too trivial.

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[mehalter]

Thanks!

[mehalter]

Really glad to see some contributions to the docs :) any language to help clarify instructions is always appreciated! No matter how silly it may seem, it's always hard to know how to word things to "click" for everyone 😁