Rollup merge of #146413 - GuillaumeGomez:rustdoc-bare-urls, r=lolbinarycat

Improve suggestion in case a bare URL is surrounded by brackets

Fixes rust-lang/rust#146162.

With this change, output looks like this:

```
  |
1 | //! [https://github.com]
  |     ^^^^^^^^^^^^^^^^^^^^ help: use an automatic link instead: `<https://github.com>`
  |
  = note: bare URLs are not automatically turned into clickable links
  = note: `#[warn(rustdoc::bare_urls)]` on by default
```

cc ```@fmease```
r? ```@lolbinarycat```

Author: Zalathar