scroller, slider, slideshow: Fix and clean up doxygen documentation.

legacy/elementary/src/lib/elm_scroller_common.h

@@ -1,3 +1,9 @@
+/**
+ * @addtogroup Scroller
+ *
+ * @{
+ */
+
 /**
  * @brief Type that controls when scrollbars should appear.
  *
@@ -38,4 +44,6 @@ typedef enum
     ELM_SCROLLER_MOVEMENT_BLOCK_HORIZONTAL = 1 << 2 /**< Block horizontal movements */
 } Elm_Scroller_Movement_Block;
 
-
+/**
+ * @}
+ */

legacy/elementary/src/lib/elm_slider_common.h

@@ -1,3 +1,12 @@
+/**
+ * @addtogroup Slider
+ *
+ * @{
+ */
+
 typedef char *(*slider_func_type)(double);
 typedef void (*slider_freefunc_type)(char *);
 
+/**
+ * @}
+ */

legacy/elementary/src/lib/elm_slideshow_common.h

@@ -1,8 +1,21 @@
-typedef struct _Elm_Slideshow_Item_Class      Elm_Slideshow_Item_Class; /**< Slideshow item class definition struct */
-typedef struct _Elm_Slideshow_Item_Class_Func Elm_Slideshow_Item_Class_Func;    /**< Class functions for slideshow item classes. */
+/**
+ * @addtogroup Slideshow
+ *
+ * @{
+ */
+
 typedef Evas_Object                        *(*SlideshowItemGetFunc)(void *data, Evas_Object *obj); /**< Image fetching class function for slideshow item classes. */
 typedef void                                (*SlideshowItemDelFunc)(void *data, Evas_Object *obj); /**< Deletion class function for slideshow item classes. */
 
+/**
+ * Slideshow item class definition struct
+ */
+typedef struct _Elm_Slideshow_Item_Class      Elm_Slideshow_Item_Class;
+
+/**
+ * Class functions for slideshow item classes.
+ */
+typedef struct _Elm_Slideshow_Item_Class_Func Elm_Slideshow_Item_Class_Func;
 /**
  * @struct _Elm_Slideshow_Item_Class
  *
@@ -18,3 +31,6 @@ struct _Elm_Slideshow_Item_Class
      } func;
 };   /**< member definitions of #Elm_Slideshow_Item_Class */
 
+/**
+ * @}
+ */