ed: update `VerifyingKey::from_bytes` with ZIP-215 info #440

Job	Run time
Build serial on no_std target (thumbv7em-none-eabi) (curve25519-dalek)	16s
Test 32/64 bit stable (i686-unknown-linux-gnu, sudo apt update && sudo apt install gcc-multilib)	2m 47s
Build serial on no_std target (thumbv7em-none-eabi) (ed25519-dalek)	34s
Test Nightly	1m 11s
Check that benchmarks compile	2m 56s
Test 32/64 bit stable (x86_64-unknown-linux-gnu)	2m 8s
Build serial on no_std target (thumbv7em-none-eabi) (x25519-dalek)	24s
Check that clippy is happy	26s
Check docs	31s
Check formatting	10s
	11m 23s

Provide feedback