Fixes #3061

[mindrones]

No description provided.

[Conduitry]

We're kind of inconsistent with how we're doing this in the various <svelte:xxx tags in the docs. I'm not sure what makes the most sense. There probably some other cases where we should be using a self-closing tag. In the places where we are using it, it looks like there's no space before the forward slash, so we should probably be consistent about that.

[mindrones]

Ah right right, I shamelessy edited the file on github 🙈
I'll make a proper PR asap! :)

[pngwn]

Since all tags have to be closed in svelte, should we just be using the closed version even for tags that accept children (since that is at least valid)?

[Conduitry]

Yeah I think that makes sense, always show the self-closing version. I think keep the section headings as they are (no slash), but use the self-closing forms in the example usages below the section names.