Rust

Add flat output option to `docs` command #3592

Job	Run time
check-generation	1m 12s
clippy-lint	3m 28s
check-style	16s
build-and-test (macos-latest, all)	4m 52s
build-and-test (macos-latest, default)	3m 40s
build-and-test (windows-2022, all)	6m 37s
build-and-test (ubuntu-22.04, default)	5m 13s
build-and-test (windows-2022, default)	6m 55s
build-and-test (ubuntu-22.04, all)	5m 9s
	37m 22s

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