Auto merge of #123065 - workingjubilee:rollup-bve45ex, r=workingjubilee

Rollup of 10 pull requests

Successful merges:

 - #122707 (Fix a typo in the alloc::string::String docs)
 - #122769 (extend comments for reachability set computation)
 - #122892 (fix(bootstrap/dist): use versioned dirs when vendoring)
 - #122896 (Update stdarch submodule)
 - #122923 (In `pretty_print_type()`, print `async fn` futures' paths instead of spans.)
 - #122950 (Add regression tests for #101903)
 - #123039 (Update books)
 - #123042 (Import the 2021 prelude in the core crate)
 - #123044 (`Instance` is `Copy`)
 - #123051 (did I mention that tests are super cool? )

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors