Fix `clippy::empty_line_after_doc_comments` lint #128

Job	Run time
Check code formatting	3s
Linux (1.56.0)	1m 8s
Linux (stable)	28s
Linux (beta)	21s
Linux (nightly)	17s
Linux (--features serde, 1.56.0)	1m 14s
Linux (--features serde, stable)	17s
Linux (--features serde, beta)	26s
Linux (--features serde, nightly)	22s
Linux (--no-default-features --features libm, 1.56.0)	1m 7s
Linux (--no-default-features --features libm, stable)	11s
Linux (--no-default-features --features libm, beta)	19s
Linux (--no-default-features --features libm, nightly)	19s
Linux (stable, --features mint)	19s
Linux (stable, --features bytemuck)	13s
Linux (stable, --features arbitrary)	13s
Linux (nightly, --features unstable)	17s
Linux (nightly, --features unstable,serde)	23s
Result	1s
	7m 58s

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