Auto merge of #4650 - main--:patch-1, r=matklad

Document that cargo test --release uses profile.bench

It certainly makes sense but it's still surprising behavior when the docs clearly state `cargo bench` = `profile.bench`, `cargo test` = `profile.test`. Had to dive into the code to figure this out.

diff --cc src/doc/book/src/reference/manifest.md
Simple merge

diff --cc src/doc/manifest.md
Simple merge