Docs: Place the vorbis comment properly, currently it's shown above the table

Originally committed as revision 22406 to svn://svn.ffmpeg.org/ffmpeg/trunk

doc/general.texi

@@ -648,7 +648,7 @@ following image formats are supported:
     @tab Used in HD-DVD and Blu-Ray discs.
 @item TwinVQ (VQF flavor)    @tab     @tab  X
 @item Vorbis                 @tab  E  @tab  X
-    @ A native but very primitive encoder exists.
+    @tab A native but very primitive encoder exists.
 @item WavPack                @tab     @tab  X
 @item Westwood Audio (SND1)  @tab     @tab  X
 @item Windows Media Audio 1  @tab  X  @tab  X