Update comment from onDestroy to onDestroyView (#10501)

Updated comment to reflect that MapView's lifecycle callback in a fragment should be called from onDestroyView rather than on onDestroy. This is consistent with that MapFragment is doing.

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/maps/MapView.java

@@ -401,7 +401,7 @@ public class MapView extends FrameLayout {
   }
 
   /**
-   * You must call this method from the parent's Activity#onDestroy() or Fragment#onDestroy().
+   * You must call this method from the parent's Activity#onDestroy() or Fragment#onDestroyView().
    */
   @UiThread
   public void onDestroy() {