docs: improve

viz-core/src/handler/fn_ext.rs

@@ -7,6 +7,5 @@ pub trait FnExt<E>: Clone + Send + Sync + 'static {
     type Output;
 
     /// Performs the call operation.
-    #[must_use]
     async fn call(&self, req: Request) -> Self::Output;
 }

viz-core/src/handler/transform.rs

@@ -4,6 +4,7 @@ pub trait Transform<H> {
     /// A new handler.
     type Output;
 
-    /// Transforms `self` and wraps [Handler][super::Handler] to a new handler.
+    /// Transforms `self` and wraps [`Handler`][super::Handler] to a new handler.
+    #[must_use]
     fn transform(&self, h: H) -> Self::Output;
 }