fix(docs): enclose inline code in backticks #433

Job	Run time
Check (stable)	14s
Test Suite (ubuntu-latest)	58s
Test Suite (windows-latest)	2m 12s
Test Suite (macOS-latest)	55s
Test Suite (stable)	1m 0s
Test Suite (stable, --no-default-features)	53s
Clippy (stable)	22s
Rustfmt (stable)	8s
Miri	1m 18s
Test Suite (stable, --no-default-features --features track-caller)	54s
Test Suite (stable, --no-default-features --features auto-install)	56s
Test Suite	2m 45s
Test Suite (stable, --features pyo3)	1m 4s
Test Suite (--no-default-features)	2m 40s
Test Suite (stable, --all-features)	1m 7s
Test Suite (--no-default-features --features track-caller)	2m 39s
Test Suite (beta)	1m 6s
Test Suite (beta, --no-default-features)	58s
Test Suite (--no-default-features --features auto-install)	2m 43s
Test Suite (beta, --no-default-features --features track-caller)	1m 0s
Test Suite (beta, --no-default-features --features auto-install)	59s
Test Suite (beta, --features pyo3)	1m 11s
Test Suite (beta, --all-features)	1m 13s
Test Suite (nightly)	1m 21s
Test Suite (nightly, --no-default-features)	1m 10s
Test Suite (nightly, --no-default-features --features track-caller)	1m 14s
Test Suite (nightly, --no-default-features --features auto-install)	1m 9s
Test Suite (nightly, --features pyo3)	1m 16s
Test Suite (nightly, --all-features)	1m 23s
	36m 48s

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