Fix PrivateCookieJar documentation example comments (#3053) #5068

Job	Run time
check-docs	22s
check	38s
cargo-hack	2m 50s
cargo-public-api-crates (axum)	32s
cargo-public-api-crates (axum-core)	21s
cargo-deny check (advisories)	25s
dependencies-are-sorted	13s
Spell Check with Typos	6s
cargo-public-api-crates (axum-extra)	27s
cargo-deny check (bans licenses sources)	24s
cargo-public-api-crates (axum-macros)	17s
test-versions (stable)	1m 21s
test-versions (beta)	1m 15s
armv5te-unknown-linux-musleabi	26s
test-nightly	1m 39s
test-msrv	1m 45s
test-docs	1m 12s
wasm32-unknown-unknown	23s
	14m 36s

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