Add help url placeholders for new pages

Bug: 38412798
Test: visual
Change-Id: I4ede523cb13790ea05309279f80a778b2086f850

src/com/android/settings/accessibility/AccessibilityShortcutPreferenceFragment.java

@@ -51,6 +51,11 @@ public class AccessibilityShortcutPreferenceFragment extends ToggleFeaturePrefer
         return MetricsEvent.ACCESSIBILITY_TOGGLE_GLOBAL_GESTURE;
     }
 
+    @Override
+    protected int getHelpResource() {
+        return R.string.help_url_accessibility_shortcut;
+    }
+
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);