Merge pull request #935 from GriffinRichards/doc-warp

Document some warp/field screen effect

src/trade.c

@@ -4750,7 +4750,7 @@ static void Task_InGameTrade(u8 taskId)
     if (!gPaletteFade.active)
     {
         SetMainCallback2(CB2_InGameTrade);
-        gFieldCallback = FieldCallback_ReturnToEventScript2;
+        gFieldCallback = FieldCB_ContinueScriptHandleMusic;
         DestroyTask(taskId);
     }
 }