Add documentation to generated public items (#236) #502

Job	Run time
Test with miri	1m 9s
Test on i686-unknown-linux-gnu with cross	1m 9s
Test with -Zsanitizer=address	46s
Test Rust 1.34.0 on ubuntu-latest	1m 9s
Test with -Zsanitizer=memory	50s
Test Rust stable on ubuntu-latest	1m 39s
Test with -Zsanitizer=leak	41s
Test Rust beta on ubuntu-latest	13s
Test Rust nightly on ubuntu-latest	26s
Test Rust stable on macos-latest	51s
Test Rust stable on windows-latest	31s
Test Rust stable-x86_64-gnu on windows-latest	38s
Test Rust stable-i686-msvc on windows-latest	33s
Test Rust stable-i686-gnu on windows-latest	39s
	11m 14s

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