docs: Resolve document warning (#841)

* docs: Remove empty code block

* docs: Resolve unresolved document link

Author: tottoto

tower/src/util/boxed_clone_sync.rs

@@ -14,7 +14,6 @@ use tower_service::Service;
 ///
 /// This is similar to [`BoxCloneService`](super::BoxCloneService) except the resulting
 /// service implements [`Sync`].
-/// ```
 pub struct BoxCloneSyncService<T, U, E>(
     Box<
         dyn CloneService<T, Response = U, Error = E, Future = BoxFuture<'static, Result<U, E>>>

tower/src/util/mod.rs

@@ -329,7 +329,7 @@ pub trait ServiceExt<Request>: tower_service::Service<Request> {
     /// may be used to implement error recovery, by turning some [`Err`]
     /// responses from the service into [`Ok`] responses. Similarly, some
     /// successful responses from the service could be rejected, by returning an
-    /// [`Err`] conditionally, depending on the value inside the [`Ok`.] Finally,
+    /// [`Err`] conditionally, depending on the value inside the [`Ok`]. Finally,
     /// this method can also be used to implement behaviors that must run when a
     /// service's future completes, regardless of whether it succeeded or failed.
     ///