Correctly deprecated sfMouseWheelEvent.

Corrected some spacing/alignment.

include/SFML/Window/Event.h

@@ -117,10 +117,13 @@ typedef struct
 } sfMouseButtonEvent;
 
 ////////////////////////////////////////////////////////////
-/// \brief Mouse wheel events parameters (deprecated)
+/// \brief Mouse wheel events parameters
+///
+/// \deprecated
+/// Use sfMouseWheelScrollEvent instead.
 /// 
 ////////////////////////////////////////////////////////////
-typedef struct
+typedef struct CSFML_DEPRECATED
 {
     sfEventType type;
     int         delta;