Improve documentation #9698

Job	Run time
make (yjit-bindgen, To fix: use patch in logs, --with-gcc=clang-14 --enable-yjit=dev --enable-zji...	5m 18s
make (check, --enable-yjit=dev, --yjit-call-threshold=1 --yjit-verify-ctx --yjit-code-gc, -T --yj...	13m 24s
make (test-bundled-gems, --enable-yjit=dev)	10m 39s
make (check, RUSTC='rustc +1.58.0', 1.58.0)	8m 33s
make (check, --enable-yjit=dev)	12m 34s
cargo clippy	53s
cargo test	1m 2s
YJIT Ubuntu result	4s
	52m 27s

Provide feedback