Qualify rust trait template comments #635

Job	Run time
Build Rust (samples/client/others/rust/)	1m 30s
Build Rust (samples/server/petstore/rust-server/)	3m 54s
Build Rust (samples/client/petstore/rust/)	1m 1s
Build Rust (samples/server/petstore/rust-axum/)	2m 55s
Build Rust (samples/server/petstore/rust-server-deprecated/)	4m 21s
	13m 41s

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