Auto merge of #54859 - pietroalbini:rollup, r=pietroalbini

Rollup of 11 pull requests

Successful merges:

 - #54078 (Expand the documentation for the `std::sync` module)
 - #54717 (Cleanup rustc/ty part 1)
 - #54781 (Add examples to `TyKind::FnDef` and `TyKind::FnPtr` docs)
 - #54787 (Only warn about unused `mut` in user-written code)
 - #54804 (add suggestion for inverted function parameters)
 - #54812 (Regression test for #32382.)
 - #54833 (make `Parser::parse_foreign_item()` return a foreign item or error)
 - #54834 (rustdoc: overflow:auto doesn't work nicely on small screens)
 - #54838 (Fix typo in src/libsyntax/parse/parser.rs)
 - #54851 (Fix a regression in 1.30 by reverting #53564)
 - #54853 (Remove unneccessary error from test, revealing NLL error.)

Failed merges:

r? @ghost

diff --cc src/librustc/ty/sty.rs
Simple merge