Update more hardcoded docs.rs URLs (#3125)

Author: Turbo87

axum-extra/src/either.rs

@@ -88,7 +88,7 @@
 //! types, but if you need to preserve the exact type then `Either*` works as well.
 //!
 //! [`BytesRejection`]: axum::extract::rejection::BytesRejection
-//! [`IntoResponse::into_response`]: https://docs.rs/axum/0.5/axum/response/index.html#returning-different-response-types
+//! [`IntoResponse::into_response`]: https://docs.rs/axum/0.8/axum/response/index.html#returning-different-response-types
 
 use std::task::{Context, Poll};
 

axum-macros/src/lib.rs

@@ -568,7 +568,7 @@ pub fn derive_from_request_parts(item: TokenStream) -> TokenStream {
 ///
 /// This macro has no effect when compiled with the release profile. (eg. `cargo build --release`)
 ///
-/// [`axum`]: https://docs.rs/axum/0.7
+/// [`axum`]: https://docs.rs/axum/0.8
 /// [`Handler`]: https://docs.rs/axum/0.8/axum/handler/trait.Handler.html
 /// [`axum::extract::State`]: https://docs.rs/axum/0.8/axum/extract/struct.State.html
 /// [`debug_handler`]: macro@debug_handler