Added missing links at documentation of SDL_FreeCursor() in header file.

include/SDL_mouse.h

@@ -254,9 +254,11 @@ extern DECLSPEC SDL_Cursor *SDLCALL SDL_GetCursor(void);
 extern DECLSPEC SDL_Cursor *SDLCALL SDL_GetDefaultCursor(void);
 
 /**
- *  \brief Frees a cursor created with SDL_CreateCursor().
+ *  \brief Frees a cursor created with SDL_CreateCursor() or similar functions.
  *
  *  \sa SDL_CreateCursor()
+ *  \sa SDL_CreateColorCursor()
+ *  \sa SDL_CreateSystemCursor()
  */
 extern DECLSPEC void SDLCALL SDL_FreeCursor(SDL_Cursor * cursor);