Merge pull request #239 from rust-osdev/doc #1070

Job	Run time
build (msrv) / rust	22s
build (stable) / rust	10s
build (nightly) / rust	29s
build no_std (stable) [Windows] / rust	3m 18s
build no_std (stable) [w/o builder] / rust	13s
style (stable) / rust	16s
build no_std (stable) / rust	22s
build no_std (msrv) / rust	41s
style (msrv) / rust	39s
tests with miri (nightly) / rust	1m 47s
build no_std (nightly) / rust	31s
style (nightly) / rust	41s
	9m 29s

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