Fabric: Lost comment in EventQueue

Summary: Just a comment.

Reviewed By: JoshuaGross

Differential Revision: D13962465

fbshipit-source-id: 31780a8ccf02d768e3d4b91e7205ceb0ee10fedf

ReactCommon/fabric/events/EventQueue.cpp

@@ -55,6 +55,9 @@ void EventQueue::onBeat(jsi::Runtime &runtime) const {
   }
 
   // No need to lock `EventEmitter::DispatchMutex()` here.
+  // The mutex protects from a situation when the `instanceHandle` can be
+  // deallocated during accessing, but that's impossible at this point because
+  // we have a strong pointer to it.
   for (const auto &event : queue) {
     if (event.eventTarget) {
       event.eventTarget->release(runtime);