Remove reference to G_PARAM_READWRITE from GParamFlags' description,
since commit
6c395244a5db added G_PARAM_READWRITE to GParamFlags.
https://bugzilla.gnome.org/show_bug.cgi?id=726037
* Since 2.26
*
* Through the #GParamFlags flag values, certain aspects of parameters
- * can be configured. See also #G_PARAM_READWRITE and #G_PARAM_STATIC_STRINGS.
+ * can be configured. See also #G_PARAM_STATIC_STRINGS.
*/
typedef enum
{