Rollup of 6 pull requests

[Manishearth]

Successful merges:

• Some improvements to the async docs #91192 (Some improvements to the async docs)
• Ensure stability directives are checked in all cases #94096 (Ensure stability directives are checked in all cases)
• Gracefully handle non-UTF-8 string slices when pretty printing #94156 (Gracefully handle non-UTF-8 string slices when pretty printing)
• Fix several asm! related issues #94169 (Fix several asm! related issues)
• Implement LowerHex on Scalar to clean up their display in rustdoc #94189 (Implement LowerHex on Scalar to clean up their display in rustdoc)
• Use Metadata::modified instead of FileTime::from_last_modification_ti… #94190 (Use Metadata::modified instead of FileTime::from_last_modification_ti…)

Failed merges:

r? @ghost
@rustbot modify labels: rollup

Create a similar rollup

[Manishearth]

@bors r+ p=5 rollup=never

[bors]

📌 Commit b172749 has been approved by Manishearth

[bors]

⌛ Testing commit b172749 with merge a472e5f46958f47653eca5585b4c8cb7e757c23c...

[bors]

💔 Test failed - checks-actions

[Manishearth]

@bors r+

[bors]

💡 This pull request was already approved, no need to approve it again.

• This pull request previously failed. You should add more commits to fix the bug, or use retry to trigger a build again.
• There's another pull request that is currently being tested, blocking this pull request: Support GATs in Rustdoc #94009

[bors]

📌 Commit b172749 has been approved by Manishearth

[rust-log-analyzer]

The job aarch64-gnu failed! Check out the build log: (web)(plain)

Click to see the possible cause of the failure (guessed by this bot)

Found 504 error codes
Found 0 error(s) in error codes
Done!
* 366 features
tidy error: /checkout/compiler/rustc_typeck/src/collect.rs: too many lines (3010) (add `// ignore-tidy-filelength` to the file to suppress this error)
some tidy checks failed

[rust-log-analyzer]

The job mingw-check failed! Check out the build log: (web)(plain)

Click to see the possible cause of the failure (guessed by this bot)

configure: rust.debug-assertions := True
configure: rust.overflow-checks := True
configure: llvm.assertions := True
configure: dist.missing-tools := True
configure: build.configure-args := ['--enable-sccache', '--disable-manage-submodu ...
configure: writing `config.toml` in current directory
configure: configure: run `python /checkout/x.py --help`
configure: ---
* highest error code: E0787
Found 504 error codes
Found 0 error(s) in error codes
Done!
tidy error: /checkout/compiler/rustc_typeck/src/collect.rs: too many lines (3010) (add `// ignore-tidy-filelength` to the file to suppress this error)
some tidy checks failed
Build completed unsuccessfully in 0:00:13