Rollup of 4 pull requests

[frewsxcv]

• Successful merges: Make rustdoc.js use license comments. #42307, Vec<T> is pronounced 'vec' #42385, Ignore variadic FFI test on AArch64 #42531, doc: a more complete explanation, and a better example #42551
• Failed merges:

[frewsxcv]

@bors r+ p=10

[bors]

📌 Commit e17ea99 has been approved by frewsxcv

[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 @GuillaumeGomez (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 Due to the way GitHub handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed.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.

Please see the contribution instructions for more information.

[bors]

⌛ Testing commit e17ea99 with merge 731a6db...

[bors]

💔 Test failed - status-appveyor

[kennytm]

libstd test failed on i686-pc-windows-msvc. Spurious?

thread '<unnamed>' panicked at 'assertion failed: a - Duration::new(0, 100) <= b', src\libstd\time\mod.rs:473
test time::tests::instant_math ... FAILED
failures:
time::tests::instant_math
test result: FAILED. 787 passed; 1 failed; 2 ignored; 0 measured; 0 filtered out

src/libstd/time/mod.rs:473:

#[test]fninstant_math(){let a = Instant::now();let b = Instant::now();let dur = b.duration_since(a);assert_almost_eq!(b - dur, a);// <-- line 473assert_almost_eq!(a + dur, b);let second = Duration::new(1,0);assert_almost_eq!(a - second + second, a);}

[frewsxcv]

Seems that way

@bors retry

[bors]

⌛ Testing commit e17ea99 with merge fe85c5f...

[bors]

💔 Test failed - status-appveyor

[kennytm]

i686-pc-windows-gnu this time, spurious, #41006.

Testing librustc stage2 (i686-pc-windows-gnu -> i686-pc-windows-gnu)
…
error: failed to remove: C:\projects\rust\build\i686-pc-windows-gnu\stage1-rustc\i686-pc-windows-gnu\release\rustc_trans.dll
Build failed, waiting for other jobs to finish...
error: build failed