docs: fix compression level range from 0-9 to 0-10 #374

Job	Run time
Rustfmt & Docs	21s
Minimum Rust compiler	44s
Minimum Rust compiler (windows-2022)	3m 15s
Minimum Rust compiler (macos-latest)	1m 37s
Minimum Rust compiler (ubuntu-latest)	1m 9s
WebAssembly (wasm32-unknown-unknown)	5s
Test (stable)	1m 32s
WebAssembly (wasm32-wasi)	7s
Test (beta)	1m 32s
Test (nightly)	1m 20s
Test (macos)	1m 23s
Test (windows)	4m 3s
Test (mingw)	1m 55s
	19m 3s

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