ci: fail on doc warnings #1450

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Job	Run time
build with MSRV (1.66.1)	1m 52s
build with default features	28s
build with no_std (ristretto255)	26s
actionlint	6s
build with no_std (ed25519)	19s
Clippy	38s
Check Rust doc	24s
build with no_std (p256)	20s
Rustfmt	19s
Check if automatically generated code is up to date	20s
test on beta	2m 28s
build with no_std (secp256k1)	20s
build with no_std (secp256k1-tr)	34s
build with no_std (rerandomized)	34s
	9m 8s

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