removed missdocs in parity.rs #308

Job	Run time
clippy	1m 12s
docs	56s
fmt	14s
feature-checks	2m 1s
test stable --no-default-features	1m 40s
wasm	56s
test stable	1m 32s
test stable --all-features	1m 27s
test beta --no-default-features	1m 31s
test beta	1m 32s
test beta --all-features	1m 19s
test nightly --no-default-features	1m 39s
test nightly	1m 34s
test nightly --all-features	1m 38s
test 1.65 --no-default-features	1m 47s
test 1.65	1m 57s
	22m 55s

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