spki

der: document `RefToOwned` and `OwnedToRef` (#1498) #3150

Job	Run time
build (1.72.0, thumbv7em-none-eabi)	27s
minimal-versions	0s
build (1.72.0, wasm32-unknown-unknown)	31s
build (stable, thumbv7em-none-eabi)	33s
build (stable, wasm32-unknown-unknown)	25s
test (1.72.0)	1m 18s
test (stable)	1m 0s
	4m 14s

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