fix(docs): enclose inline code in backticks #424

Job	Run time
Miri	1m 34s
Check (stable)	18s
Rustfmt (stable)	7s
Clippy (stable)	26s
Test Suite (stable)	1m 1s
Test Suite (stable, --no-default-features)	59s
Test Suite	1m 34s
Test Suite (--no-default-features)	1m 8s
Test Suite (stable, --no-default-features --features track-caller)	52s
Test Suite (ubuntu-latest)	1m 12s
Test Suite (windows-latest)	2m 18s
Test Suite (stable, --no-default-features --features auto-install)	51s
Test Suite (--no-default-features --features track-caller)	1m 10s
Test Suite (--no-default-features --features auto-install)	1m 11s
Test Suite (stable, --features pyo3)	1m 0s
Test Suite (macOS-latest)	1m 3s
Test Suite (stable, --all-features)	1m 11s
Test Suite (beta)	1m 5s
Test Suite (beta, --no-default-features)	54s
Test Suite (beta, --no-default-features --features track-caller)	55s
Test Suite (beta, --no-default-features --features auto-install)	1m 46s
Test Suite (beta, --features pyo3)	1m 6s
Test Suite (beta, --all-features)	1m 8s
Test Suite (nightly)	1m 38s
Test Suite (nightly, --no-default-features)	1m 13s
Test Suite (nightly, --no-default-features --features track-caller)	1m 10s
Test Suite (nightly, --no-default-features --features auto-install)	1m 8s
Test Suite (nightly, --features pyo3)	1m 14s
Test Suite (nightly, --all-features)	1m 21s
	32m 33s

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