gsk: Small documentation additions

gsk/gskenums.h

@@ -45,6 +45,7 @@
  * @GSK_CROSS_FADE_NODE: A node that cross-fades between two children
  * @GSK_TEXT_NODE: A node containing a glyph string
  * @GSK_BLUR_NODE: A node that applies a blur
+ * @GSK_DEBUG_NODE: Debug information that does not affect the rendering
  *
  * The type of a node determines what the node is rendering.
  **/

gsk/gskrendernode.h

@@ -53,6 +53,15 @@ struct _GskShadow
   float radius;
 };
 
+/**
+ * GskParseErrorFunc:
+ * @section: the #GtkCssSection where the error occurred
+ * @error:  the error
+ * @user_data: user data
+ *
+ * The type of callback that is called when a parse error occurs
+ * during deserialization of node data.
+ */
 typedef void           (* GskParseErrorFunc)                    (const GtkCssSection *section,
                                                                  const GError        *error,
                                                                  gpointer             user_data);