doc: Include and fix GstControlPoint

docs/libs/gstreamer-libs-sections.txt

@@ -58,6 +58,7 @@ gst_direct_control_binding_get_type
 <TITLE>GstTimedValueControlSource</TITLE>
 <INCLUDE>libs/controller/gsttimedvaluecontrolsource.h</INCLUDE>
 GstTimedValueControlSource
+GstControlPoint
 gst_timed_value_control_source_find_control_point_iter
 gst_timed_value_control_source_set
 gst_timed_value_control_source_set_from_list

libs/gst/controller/gsttimedvaluecontrolsource.h

@@ -52,6 +52,8 @@ typedef struct _GstControlPoint GstControlPoint;
 
 /**
  * GstControlPoint:
+ * @timestamp: timestamp of the value change
+ * @value: the new value
  *
  * a internal structure for value+time and various temporary
  * values used for interpolation. This "inherits" from
@@ -60,10 +62,10 @@ typedef struct _GstControlPoint GstControlPoint;
 struct _GstControlPoint
 {
   /* fields from GstTimedValue. DO NOT CHANGE! */
-  GstClockTime timestamp;       /* timestamp of the value change */
-  gdouble value;                /* the new value */
+  GstClockTime timestamp;
+  gdouble value;
 
-  /* internal fields */
+  /*< private >*/
 
   /* Caches for the interpolators */
   /* FIXME: we should not have this here already ... */