More docs fixes

Remove the g*alias.h from the ignore lists

  Remove other old files from ignore lists

  Clean up gobject docs

gobject/gparamspecs.h

@@ -965,6 +965,8 @@ struct _GParamSpecVariant
   GParamSpec    parent_instance;
   GVariantType *type;
   GVariant     *default_value;
+
+  /*< private >*/
   gpointer      padding[4];
 };