cpal

doc: improvements for SampleFormat (#885) #851

Job	Run time
cargo-publish	33s
clippy-test	58s
linux-check-and-test-armv7	1m 46s
asmjs-wasm32-test (wasm32-unknown-emscripten)	58s
rustfmt-check	11s
ubuntu-test	35s
wasm32-bindgen-test (wasm32-unknown-unknown)	22s
wasm32-wasi-test (wasm32-wasi)	19s
android-apk-build	1m 41s
android-check	40s
ios-build	2m 43s
macos-test	1m 2s
wasm-beep-build	33s
windows-test (x86_64)	3m 44s
windows-test (i686)	3m 45s
	19m 50s

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