Fix typos in comment

src/libANGLE/WorkerThread.cpp

@@ -298,7 +298,7 @@ std::shared_ptr<WaitableEvent> DelegateWorkerPool::postWorkerTask(std::shared_pt
 {
     auto waitable = std::make_shared<DelegateWaitableEvent>();
 
-    // The task will be deleted bu RunTask(...) its execution.
+    // The task will be deleted by DelegateWorkerTask::RunTask(...) after its execution.
     DelegateWorkerTask *workerTask = new DelegateWorkerTask(task, waitable);
     auto *platform                 = ANGLEPlatformCurrent();
     platform->postWorkerTask(platform, DelegateWorkerTask::RunTask, workerTask);