k256: Update NCC audit link in docs (#1082) #351

Job	Run time
build (1.73.0, thumbv7em-none-eabi)	23s
cross (armv7-unknown-linux-gnueabihf, 1.73.0)	1m 50s
build (1.73.0, wasm32-unknown-unknown)	24s
doc	51s
cross (armv7-unknown-linux-gnueabihf, stable)	1m 59s
build (stable, thumbv7em-none-eabi)	18s
cross (aarch64-unknown-linux-gnu, 1.73.0)	1m 21s
build (stable, wasm32-unknown-unknown)	15s
cross (aarch64-unknown-linux-gnu, stable)	1m 13s
test (i686-unknown-linux-gnu, 1.73.0, sudo apt update && sudo apt install gcc-multilib)	1m 37s
cross (powerpc-unknown-linux-gnu, 1.73.0)	1m 33s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	1m 33s
cross (powerpc-unknown-linux-gnu, stable)	1m 24s
test (x86_64-unknown-linux-gnu, 1.73.0)	1m 15s
test (x86_64-unknown-linux-gnu, stable)	1m 0s
	16m 56s

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