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ctutils: add toplevel docs about `CtAssign` trait (#1409) #1101

Job	Run time
test (stable)	10s
test (1.85.0)	15s
build (1.85.0, thumbv7em-none-eabi)	17s
build (stable, thumbv7em-none-eabi)	21s
build (1.85.0, wasm32-unknown-unknown)	19s
build (stable, wasm32-unknown-unknown)	19s
minimal-versions / minimal-versions	34s
	2m 15s

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