Add doxygen comment..

include/vlc_vout.h

@@ -215,7 +215,7 @@ struct subpicture_region_t
 
     char            *psz_text;       /**< text string comprising this region */
     char            *psz_html;       /**< HTML version of subtitle (NULL = use psz_text) */
-    text_style_t    *p_style;  /* a description of the text style formatting */
+    text_style_t    *p_style;        /**< a description of the text style formatting */
 
     subpicture_region_t *p_next;                /**< next region in the list */
     subpicture_region_t *p_cache;       /**< modified version of this region */