Add compatibility section to the `SerializableState` docs (#1694) #2500

Job	Run time
test (1.81.0)	17s
build (1.81.0, thumbv7em-none-eabi)	17s
test (stable)	37s
build (1.81.0, wasm32-unknown-unknown)	20s
build (stable, thumbv7em-none-eabi)	26s
build (stable, wasm32-unknown-unknown)	25s
	2m 22s

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