docs: making table headers consistent #4978

Job	Run time
rustfmt	11s
Clippy	30s
no-std (stable, wasm32-unknown-unknown)	1m 28s
Check Rust stable on ubuntu with --all-targets --no-default-features	43s
no-std (nightly, wasm32-unknown-unknown)	48s
Check Rust stable on ubuntu with --all-targets	40s
Test Rust stable on ubuntu with --profile test-release	5m 53s
Test Rust nightly on windows-2022	0s
Check Rust stable on ubuntu with --all-targets --all-features	36s
Test Rust stable on ubuntu with --profile test-release --doc	3m 16s
Check Rust nightly on ubuntu with --all-targets --no-default-features	1m 52s
Test Rust nightly on ubuntu with --profile test-release	8m 44s
Check Rust nightly on ubuntu with --all-targets	39s
Test Rust nightly on ubuntu with --profile test-release --doc	3m 42s
Check Rust nightly on ubuntu with --all-targets --all-features	42s
	29m 44s

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