Fix misplaced comment in error handling example (#3529) #5827

Job	Run time
cargo-hack	2m 50s
check-docs	59s
check	38s
cargo-deny check (advisories)	28s
cargo-public-api-crates (axum)	35s
Spell Check with Typos	5s
cargo-public-api-crates (axum-extra)	29s
cargo-deny check (bans licenses sources)	28s
cargo-public-api-crates (axum-macros)	20s
dependencies-are-sorted	5s
cargo-public-api-crates (axum-core)	18s
test-versions (stable)	1m 12s
test-nightly	1m 2s
test-versions (beta)	1m 9s
test-msrv	2m 2s
test-docs	59s
armv5te-unknown-linux-musleabi	1m 2s
wasm32-unknown-unknown	17s
	14m 58s

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