add section on using; change spelling to US #996

Job	Run time
Smoke-test fuzzing targets (default)	2m 35s
Clippy	26s
Build and test (stable, ubuntu-latest, x86_64-unknown-linux-gnu)	48s
Smoke-test fuzzing targets (c-allocator)	2m 42s
Clippy (--no-default-features --features="c-allocator")	20s
QEMU build & test (stable, ubuntu-latest, s390x-unknown-linux-gnu, s390x-linux-gnu-gcc)	43s
Smoke-test fuzzing targets (rust-allocator)	2m 30s
Build and test (msrv, ubuntu-latest, x86_64-unknown-linux-gnu)	57s
Clippy (--no-default-features --features="rust-allocator")	22s
QEMU build & test (stable, ubuntu-latest, i686-unknown-linux-gnu, i686-linux-gnu-gcc)	55s
Build and test (beta, ubuntu-latest, x86_64-unknown-linux-gnu)	1m 2s
Build and test (stable, macos-latest, x86_64-apple-darwin)	1m 33s
Smoke-test fuzzing targets (stable, macos-14, aarch64-apple-darwin)	3m 9s
Miri	1m 42s
Build and test (stable, macos-14, aarch64-apple-darwin)	1m 12s
dynamic library	16s
Build and test (stable-x86_64-gnu, windows-2022, x86_64-pc-windows-gnu)	2m 30s
wasm32	44s
	24m 26s

Provide feedback