Fixed Javadoc issues

Author: brianwernick

library/src/main/java/com/devbrackets/android/recyclerext/adapter/RecyclerHeaderAdapter.java

@@ -162,7 +162,7 @@ public int getHeaderViewType(int childPosition) {
 
     /**
      * Retrieves the view type for the child view at the specified
-     * <code>childPosition</code>.  This value will be &'ed with the
+     * <code>childPosition</code>.  This value will be &amp;'ed with the
      * inverse of {@link #HEADER_VIEW_TYPE_MASK} to make sure the header
      * and child view types don't overlap.
      * @param childPosition The position of the child to get the type for

library/src/main/java/com/devbrackets/android/recyclerext/adapter/RecyclerHeaderCursorAdapter.java

@@ -176,7 +176,7 @@ public int getHeaderViewType(int childPosition) {
 
     /**
      * Retrieves the view type for the child view at the specified
-     * <code>childPosition</code>.  This value will be &'ed with the
+     * <code>childPosition</code>.  This value will be &amp;'ed with the
      * inverse of {@link #HEADER_VIEW_TYPE_MASK} to make sure the header
      * and child view types don't overlap.
      * @param childPosition The position of the child to get the type for