axum-core/macros: Change `Display` impl to match `body_text()` result #5194

Job	Run time
check-docs	13s
check	46s
cargo-public-api-crates (axum)	28s
cargo-hack	2m 46s
cargo-deny check (advisories)	21s
cargo-public-api-crates (axum-core)	19s
dependencies-are-sorted	19s
cargo-public-api-crates (axum-extra)	25s
cargo-public-api-crates (axum-macros)	17s
cargo-deny check (bans licenses sources)	22s
Spell Check with Typos	6s
test-docs	1m 19s
test-nightly	1m 17s
test-msrv	1m 59s
armv5te-unknown-linux-musleabi	22s
test-versions (stable)	1m 33s
wasm32-unknown-unknown	10s
test-versions (beta)	1m 28s
	14m 30s

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