Replace async_trait with AFIT / RPITIT (#2308)

Co-authored-by: Jonas Platte <[email protected]>

axum-extra/src/handler/mod.rs

@@ -47,7 +47,6 @@ pub trait HandlerCallWithExtractors<T, S>: Sized {
     /// use axum_extra::handler::HandlerCallWithExtractors;
     /// use axum::{
     ///     Router,
-    ///     async_trait,
     ///     routing::get,
     ///     extract::FromRequestParts,
     /// };
@@ -68,7 +67,6 @@ pub trait HandlerCallWithExtractors<T, S>: Sized {
     /// // extractors for checking permissions
     /// struct AdminPermissions {}
     ///
-    /// #[async_trait]
     /// impl<S> FromRequestParts<S> for AdminPermissions
     /// where
     ///     S: Send + Sync,
@@ -82,7 +80,6 @@ pub trait HandlerCallWithExtractors<T, S>: Sized {
     ///
     /// struct User {}
     ///
-    /// #[async_trait]
     /// impl<S> FromRequestParts<S> for User
     /// where
     ///     S: Send + Sync,