Fix AMR-NB entry in the supported audio codecs list.

The decoding and encoding rows were switched around.

Originally committed as revision 22128 to svn://svn.ffmpeg.org/ffmpeg/trunk

doc/general.texi

@@ -549,7 +549,7 @@ following image formats are supported:
 @item ADPCM Westwood Studios IMA @tab     @tab  X
     @tab Used in Westwood Studios games like Command and Conquer.
 @item ADPCM Yamaha           @tab  X  @tab  X
-@item AMR-NB                 @tab  X  @tab  E
+@item AMR-NB                 @tab  E  @tab  X
     @tab encoding supported through external library libopencore-amrnb
 @item AMR-WB                 @tab     @tab  E
     @tab decoding supported through external library libopencore-amrwb