docs: making table headers consistent #4979

Job	Run time
rustfmt	6s
no-std (stable, wasm32-unknown-unknown)	38s
Clippy	33s
Check Rust stable on ubuntu with --all-targets --no-default-features	32s
no-std (nightly, wasm32-unknown-unknown)	47s
Check Rust stable on ubuntu with --all-targets	38s
Test Rust stable on ubuntu with --profile test-release	5m 44s
Check Rust stable on ubuntu with --all-targets --all-features	38s
Test Rust nightly on windows-2022	0s
Test Rust stable on ubuntu with --profile test-release --doc	3m 31s
Check Rust nightly on ubuntu with --all-targets --no-default-features	43s
Test Rust nightly on ubuntu with --profile test-release	5m 59s
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	48s
	24m 58s

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