Problem rendering TOC

[pierwill]

cb3fb94 added a TOC to this page: https://rustc-dev-guide.rust-lang.org/query.html. Locally, this worked fine, but currently it looks like this:

[camelid]

What's weird also is that the last entry "External Links" is rendered correctly...

[camelid]

Ah, I think I have a fix (though I think this is still a bug in the toc tool we use, cc @igaray who knows more about that).

[camelid]

Looks good on the website now!