Fix typos in testing example (#2542) #4343

Job	Run time
check-docs	38s
cargo-public-api-crates (axum)	1m 2s
cargo-public-api-crates (axum-core)	50s
cargo-public-api-crates (axum-extra)	1m 0s
cargo-public-api-crates (axum-macros)	50s
cargo-hack	5m 52s
cargo-deny check (advisories)	22s
check	2m 14s
cargo-deny check (bans licenses sources)	31s
dependencies-are-sorted	46s
Spell Check with Typos	4s
test-docs	1m 52s
test-nightly	2m 4s
test-msrv	5m 50s
test-versions (stable)	3m 28s
test-versions (beta)	4m 46s
armv5te-unknown-linux-musleabi	46s
wasm32-unknown-unknown	31s
	33m 26s

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