Rust

Add docs for `dmo-stf`. #3312

Job	Run time
check	3m 4s
test	2m 32s
check-licenses	44s
coverage	3m 25s
cargo-doc-artifact	1m 19s
check-demo-rollup-table-of-contents	10s
validate-packages-to-publish-yml	45s
deploy-github-pages	0s
check-demo-rollup-bash-commands	0s
features	0s
	11m 59s

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