docs: Improve doc formatting with backticks #397

Job	Run time
miri	5m 0s
Check MSRV and minimal-versions	35s
nostd_build (1.63.0, thumbv6m-none-eabi)	23s
clippy	17s
nostd_build (stable, thumbv6m-none-eabi)	8s
tests (1.63.0)	56s
tests (stable, arbitrary)	48s
tests (stable, quickcheck)	38s
tests (stable, rayon)	44s
tests (stable, rustc-rayon)	41s
tests (stable, serde)	50s
tests (stable, borsh)	35s
tests (stable, std)	34s
tests (beta)	38s
tests (nightly, test build benchmarks)	37s
Success	1s
	13m 25s

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