zeroize: remove explicit passing of the docsrs configuration flag #803

Job	Run time
x86 (x86_64-unknown-linux-gnu, 1.85.0)	20s
build (1.85.0, armv7a-none-eabi)	17s
build (1.85.0, thumbv7em-none-eabi)	19s
build (1.85.0, wasm32-unknown-unknown)	18s
x86 (x86_64-unknown-linux-gnu, stable)	26s
cross (powerpc-unknown-linux-gnu, stable)	48s
build (stable, armv7a-none-eabi)	17s
build (stable, wasm32-unknown-unknown)	16s
build (stable, thumbv7em-none-eabi)	16s
cross (aarch64-unknown-linux-gnu, stable)	49s
test (i686-unknown-linux-gnu, ubuntu-latest, stable, sudo apt update && sudo apt install gcc-mult...	45s
cross (powerpc-unknown-linux-gnu, 1.85.0)	39s
cross (aarch64-unknown-linux-gnu, 1.85.0)	45s
test (x86_64-apple-darwin, macos-latest, stable)	20s
test (x86_64-pc-windows-msvc, windows-latest, 1.85.0)	30s
test (x86_64-pc-windows-msvc, windows-latest, stable)	56s
test (x86_64-apple-darwin, macos-latest, 1.85.0)	25s
test (x86_64-unknown-linux-gnu, ubuntu-latest, stable)	16s
minimal-versions / minimal-versions	1m 2s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.85.0)	15s
test (i686-unknown-linux-gnu, ubuntu-latest, 1.85.0, sudo apt update && sudo apt install gcc-mult...	27s
	10m 26s

Provide feedback