Update some class descriptions

src/Gui/timeline/AbstractGraphicsMediaItem.h

@@ -32,6 +32,9 @@
 class TracksView;
 class Clip;
 
+/**
+ * \brief Base class for Audio/Video items.
+ */
 class AbstractGraphicsMediaItem : public QObject, public QGraphicsItem
 {
     Q_OBJECT

src/Gui/timeline/GraphicsAudioItem.h

@@ -33,6 +33,9 @@
 
 #define ROUNDED_RECT_RADIUS 5
 
+/**
+ * \brief Represents an audio item.
+ */
 class GraphicsAudioItem : public AbstractGraphicsMediaItem
 {
     Q_OBJECT

src/Gui/timeline/GraphicsMovieItem.h

@@ -32,6 +32,9 @@
 
 #define ROUNDED_RECT_RADIUS 5
 
+/**
+ * \brief Represents a video item.
+ */
 class GraphicsMovieItem : public AbstractGraphicsMediaItem
 {
     Q_OBJECT

src/Gui/timeline/Timeline.h

@@ -33,6 +33,9 @@ class TracksControls;
 class TracksRuler;
 class WorkflowRenderer;
 
+/**
+ * \brief Entry point of the timeline widget.
+ */
 class Timeline : public QWidget
 {
     Q_OBJECT

src/Gui/timeline/TracksView.h

@@ -39,7 +39,7 @@ class GraphicsMovieItem;
 class WorkflowRenderer;
 
 /**
- * \brief Class which manage the timeline using QGraphicsItems
+ * \brief Class managing the timeline using QGraphicsItems.
  */
 class TracksView : public QGraphicsView
 {