Kernel: Renamed some functions for clarity.

- ReleaseNextThread->WakeupNextThread
- ReleaseAllWaitingThreads->WakeupAllWaitingThreads.

src/core/hle/kernel/event.cpp

@@ -47,7 +47,7 @@ ResultCode SignalEvent(const Handle handle) {
         return InvalidHandle(ErrorModule::Kernel);
 
     evt->signaled = true;
-    evt->ReleaseAllWaitingThreads();
+    evt->WakeupAllWaitingThreads();
 
     return RESULT_SUCCESS;
 }