Add compatibility section to the `SerializableState` docs (#1694) #2916

Job	Run time
build (1.81.0, thumbv7em-none-eabi)	39s
build (1.81.0, wasm32-unknown-unknown)	44s
minimal-versions	0s
test (1.81.0)	33s
build (stable, thumbv7em-none-eabi)	48s
test (stable)	40s
build (stable, wasm32-unknown-unknown)	47s
test (nightly)	38s
	4m 49s

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