Fix missing link in `Tracker::broadcast` docs

futures/src/subscription/tracker.rs

@@ -131,6 +131,8 @@ where
     ///
     /// This method publishes the given event to all the subscription streams
     /// currently open.
+    ///
+    /// [`Recipe::stream`]: trait.Recipe.html#method.stream
     pub fn broadcast(&mut self, event: Event) {
         self.subscriptions
             .values_mut()