Fix formatting

Author: AlphaKeks

tokio-util/src/task/join_map.rs

@@ -1086,7 +1086,12 @@ where
     /// [`LocalSet`]: tokio::task::LocalSet
     /// [`join_next`]: JoinMap::join_next
     #[track_caller]
-    pub fn spawn_local_on<F>(&mut self, key: K, task: F, local_set: &LocalSet) -> std::io::Result<()>
+    pub fn spawn_local_on<F>(
+        &mut self,
+        key: K,
+        task: F,
+        local_set: &LocalSet,
+    ) -> std::io::Result<()>
     where
         F: Future<Output = V>,
         F: 'static,