Allow help to be defined to intent uri

Allow help uris to be either an intent uri or as uri (as they were
before). Also add a default help uri, and specific helps for several
screens.

Bug: 15475009
Change-Id: Iff982892973f01d32ff61ea88d4844e9a7153500

src/com/android/settings/DisplaySettings.java

@@ -422,6 +422,11 @@ public class DisplaySettings extends SettingsPreferenceFragment implements
         return false;
     }
 
+    @Override
+    protected int getHelpResource() {
+        return R.string.help_uri_display;
+    }
+
     public static final Indexable.SearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
             new BaseSearchIndexProvider() {
                 @Override