rustdoc: stability and portability "pills" are sometimes broken to the next line

[euclio]

Screenshot demonstrating the issue:

See https://doc.rust-lang.org/nightly/std/intrinsics/index.html for more examples.

I would expect these pills to stay on the same line as the item name except in the case of very long function names.

Meta

rustc --version --verbose:

rustc 1.58.1 (db9d1b20b 2022-01-20)
binary: rustc
commit-hash: db9d1b20bba1968c1ec1fc49616d4742c1725b4b
commit-date: 2022-01-20
host: x86_64-apple-darwin
release: 1.58.1
LLVM version: 13.0.0

[jsha]

This was referenced somewhat in #85651 (comment) - @dns2utf8 @GuillaumeGomez.

In retrospect, I think the stability pill should be moved back to be part of the description text. That would avoid this ugly wrapping, and would align groups of stability pills with each other (on desktop), at the small cost of putting the stability pill on the next line on mobile (which I think is fine).