chore: Improve document about certificate #2593

Job	Run time
cargo-deny check	21s
Check unused dependencies (ubuntu-latest)	3m 39s
Check unused dependencies (macOS-latest)	3m 7s
codegen	12s
Interop Tests (ubuntu-latest)	22s
Check unused dependencies (windows-latest)	6m 36s
Check MSRV	42s
Interop Tests (macOS-latest)	32s
Interop Tests (windows-latest)	3m 3s
rustfmt	17s
test (ubuntu-latest)	2m 22s
test (macOS-latest)	1m 34s
check (ubuntu-latest)	43s
test (windows-latest)	4m 10s
check (macOS-latest)	46s
check (windows-latest)	2m 26s
	30m 52s

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