build

Revise `array_write_read` and `async_array_write_read` examples #104

Job	Run time
clippy	1m 31s
fmt	28s
test	2m 53s
build (stable, --features "")	50s
build (stable, --all-features)	1m 58s
build (stable, --no-default-features)	41s
build (1.71, --features "")	58s
build (1.71, --all-features)	2m 9s
build (1.71, --no-default-features)	55s
build (beta, --features "")	52s
build (beta, --all-features)	1m 51s
build (beta, --no-default-features)	44s
build (nightly, --features "")	1m 7s
build (nightly, --all-features)	1m 58s
build (nightly, --no-default-features)	44s
	19m 39s

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