improve collapse toggle render (css)

[rap2hpoutre]

The [-] toggle for functions in docs seems too big. It's just an impression, but it's something I noticed long time ago (maybe I have bad taste). I never thought to fix it, but, today I think: "Ok, why not suggest it.". Feel free to close without explanation!

Preview changes below:

From this:

To this:

[rust-highfive]

Some changes occurred in HTML/CSS.

cc @GuillaumeGomez

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @frewsxcv (or someone else) soon.

If any changes to this PR are deemed necessary, please add them as extra commits. This ensures that the reviewer can see what has changed since they last reviewed the code. Due to the way GitHub handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed. Large or tricky changes may require several passes of review and changes.

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[GuillaumeGomez]

Seems like a good change, however:

It seems a bit too little in here. :p

[rap2hpoutre]

@GuillaumeGomez Thank you! You are right! I just updated my PR to only match on h4 > .collapse-toggle, h3 > .collapse-toggle (for function declarations only). So there will be no improvement for the screenshot you sent, only what I pointed. Maybe we could think at this part after. I have some other improvements in mind but I don't want to mess up this PR.

[GuillaumeGomez]

Great, thanks! And yes please keep your changes into different PRs so it makes reviewers' life simpler. 😉

Also, can you squash your commits please? Once done, I'll merge. (and comment on the PR once done so I'm notified.)

[rap2hpoutre]

@GuillaumeGomez Done! Thanks!

[GuillaumeGomez]

Thanks!

@bors: r+ rollup

[bors]

📌 Commit 7a50784 has been approved by GuillaumeGomez