Rust

docs: Improve substitute_type rules and alternatives #5516

Job	Run time
Cargo fmt	27s
Check unused dependencies	1m 44s
Cargo check	11m 7s
Cargo clippy (WASM)	1m 51s
Check documentation and run doc tests	3m 49s
Cargo clippy	5m 40s
Cargo check (WASM)	1m 34s
Test (no_std)	0s
Test chainhead backend	0s
Test (Light Client)	0s
Test (Native)	0s
Test (WASM)	0s
	26m 12s

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