Updated doc link versions to use more explicit 0.7 version. #4110

Job	Run time
cargo-hack	3m 24s
check	36s
cargo-public-api-crates (axum)	28s
check-docs	23s
cargo-public-api-crates (axum-core)	15s
cargo-deny check (advisories)	26s
dependencies-are-sorted	20s
cargo-public-api-crates (axum-extra)	33s
cargo-deny check (bans licenses sources)	26s
cargo-public-api-crates (axum-macros)	19s
Spell Check with Typos	9s
test-msrv	1m 17s
test-docs	1m 44s
armv5te-unknown-linux-musleabi	34s
test-nightly	1m 45s
test-versions (stable)	2m 0s
wasm32-unknown-unknown	24s
test-versions (beta)	2m 0s
	17m 3s

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