Rust

Add docs for `dmo-stf`. #3316

Job	Run time
check-licenses	37s
check-demo-rollup-table-of-contents	11s
check	2m 36s
coverage	4m 52s
test	2m 41s
validate-packages-to-publish-yml	36s
cargo-doc-artifact	1m 16s
deploy-github-pages	0s
features	0s
check-demo-rollup-bash-commands	0s
	12m 49s

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