libmm-glib,pco: add some more missing documentation for MMPco

libmm-glib/mm-pco.c

@@ -158,6 +158,16 @@ mm_pco_set_data (MMPco *self,
 
 /*****************************************************************************/
 
+/**
+ * mm_pco_from_variant:
+ * @variant: A variant with the PCO information.
+ * @error: Return location for error or %NULL.
+ *
+ * Creates a new #MMPco object with the values exposed in
+ * the variant.
+ *
+ * Returns: (transfer full): A #MMPco or %NULL if @error is set. The returned value should be freed with g_object_unref().
+ */
 MMPco *
 mm_pco_from_variant (GVariant *variant,
                      GError **error)
@@ -234,7 +244,7 @@ mm_pco_to_variant (MMPco *self)
 
 /**
  * mm_pco_list_free:
- * @pco_list (element-type ModemManager.Pco): a #GList of #MMPco.
+ * @pco_list: (transfer full)(element-type ModemManager.Pco): a #GList of #MMPco.
  *
  * Frees all of the memory used by a #GList of #MMPco.
  */
@@ -246,14 +256,14 @@ mm_pco_list_free (GList *pco_list)
 
 /**
  * mm_pco_list_add:
- * @pco_list (element-type ModemManager.Pco): a #GList of #MMPco.
- * @pco:: a #MMPco to add to the given list.
+ * @pco_list: (transfer full)(element-type ModemManager.Pco): a #GList of #MMPco.
+ * @pco: (transfer none): a #MMPco to add to the given list.
  *
  * Adds a #MMPco to a given PCO list. #MMPco objects stored in the order of
  * their session ID. An existing PCO with the same session ID is overwritten
  * with the new value.
  *
- * Returns: (element-type ModemManager.Pco): the new start of an updated or newly allocated #GList of #MMPco.
+ * Returns: (transfer full)(element-type ModemManager.Pco): the new start of an updated or newly allocated #GList of #MMPco.
  */
 GList *
 mm_pco_list_add (GList *pco_list,