Correct the comment

Fix: 150910210
Test: n/a. only update the comment
Change-Id: I0017cdc7729e1947fc0b6f3c3c1c2f5f60fd2ba5

services/core/java/com/android/server/wm/AccessibilityController.java

@@ -1392,7 +1392,7 @@ final class AccessibilityController {
                     tempWindowStatesList.add(w);
                 }
             }, false /* traverseTopToBottom */);
-            // Insert the re-parented windows in another display on top of their parents in
+            // Insert the re-parented windows in another display below their parents in
             // default display.
             mService.mRoot.forAllWindows(w -> {
                 final WindowState parentWindow = findRootDisplayParentWindow(w);