Update accordions.mdx

[dino475]

Documentation changes

Updated the icon field in the accordions page to explain how to use custom SVG code

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[dino475]

@ethanpalm LMK what you think here - we might want to update this across the docs

[ethanpalm]

@dino475 do you know if there are any features that accept icons that don't allow for all of

• Lucide
• Font Awesome
• SVGs
• URL to external icon
• Relative path to icon stored in the repo with docs

Since a lot of features can use icons, I think a snippet with consistent information is the way to go. I'll push that change to your branch.

[ethanpalm]

Created snippets for optional/required icon properties and added them to the relevant pages.