Merge pull request #619 from ledsun/add_rdoc #701

Job	Run time
ci-data	6s
Compile native gem for arm64-darwin	6m 5s
Compile native gem for aarch64-linux	6m 14s
Compile native gem for x86_64-darwin	6m 14s
Compile native gem for x86_64-linux	8m 52s
Compile native gem for x64-mingw-ucrt	6m 15s
Compile native gem for x86_64-linux-musl	5m 55s
Compile native gem for aarch64-linux-musl	5m 51s
	45m 32s

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