Fix typo in impl_methods.rs docs (#1508) #466

Job	Run time
clippy/stable	20s
format/nightly	13s
nostd/thumbv6m-none-eabi/stable	19s
docs/nightly	21s
miri	8m 12s
cargo-careful	1m 53s
cross_test/s390x-unknown-linux-gnu/stable	6m 40s
cross_test/i686-unknown-linux-gnu/stable	1m 44s
Pass MSRV values to other jobs	2s
blas-msrv	40s
tests/stable	2m 33s
tests/beta	2m 47s
tests/nightly	2m 58s
tests/1.64.0	3m 59s
conclusion	4s
	32m 45s

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