docs: making table headers consistent #4981

Job	Run time
Clippy	33s
Check Rust stable on ubuntu with --all-targets --no-default-features	34s
Check Rust stable on ubuntu with --all-targets	41s
no-std (stable, wasm32-unknown-unknown)	48s
rustfmt	6s
Check Rust stable on ubuntu with --all-targets --all-features	46s
no-std (nightly, wasm32-unknown-unknown)	43s
Test Rust stable on ubuntu with --profile test-release	5m 43s
Check Rust nightly on ubuntu with --all-targets --no-default-features	37s
Test Rust stable on ubuntu with --profile test-release --doc	3m 22s
Check Rust nightly on ubuntu with --all-targets	40s
Test Rust nightly on windows-2022	0s
Test Rust nightly on ubuntu with --profile test-release	5m 51s
Check Rust nightly on ubuntu with --all-targets --all-features	45s
Test Rust nightly on ubuntu with --profile test-release --doc	3m 40s
	24m 49s

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