Tweak documentation for into_raw_vec_and_offset (#1432) #271

Job	Run time
docs/stable	21s
clippy/stable	29s
cross_test/s390x-unknown-linux-gnu/stable	5m 54s
cargo-careful	2m 10s
cross_test/i686-unknown-linux-gnu/stable	2m 23s
format/nightly	11s
nostd/thumbv6m-none-eabi/stable	16s
tests/stable	2m 59s
tests/beta	3m 20s
tests/nightly	3m 25s
tests/1.64.0	6m 39s
conclusion	1s
	28m 8s

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