Adding help links to font size and display settings screens.

bug: 33110518
Change-Id: I5b75adc493ed0ab16a2dd653554af7a7c6e137ad

src/com/android/settings/display/ScreenZoomSettings.java

@@ -93,6 +93,11 @@ public class ScreenZoomSettings extends PreviewSeekBarPreferenceFragment impleme
         }
     }
 
+    @Override
+    public int getHelpResource() {
+        return R.string.help_url_display_size;
+    }
+
     @Override
     public int getMetricsCategory() {
         return MetricsEvent.DISPLAY_SCREEN_ZOOM;