Fix nits

Author: grantland

ParseUI-Widget/src/main/java/com/parse/ParseQueryAdapter.java

@@ -372,9 +372,11 @@ public void loadObjects() {
   }
 
   private void loadNextPage(final boolean shouldClear) {
-    if (shouldClear && pager != null) {
-      cts.cancel();
-      pager = null;
+    synchronized (lock) {
+      if (shouldClear && pager != null) {
+        cts.cancel();
+        pager = null;
+      }
     }
 
     notifyOnLoadingListeners();

ParseUI-Widget/src/main/java/com/parse/widget/util/ParseQueryPager.java

@@ -67,7 +67,7 @@ public interface OnObjectsChangedCallback<T extends ParseQueryPager> {
     void onItemRangeInserted(T sender, int positionStart, int itemCount);
 
     /**
-     * Called whenever one or more items have been removed from the result set.
+     * Called whenever one or more items have been moved from the result set.
      * @param sender The changing pager.
      * @param fromPosition The position from which the items were moved.
      * @param toPosition The destination position of the items.