remove redundant entry from manpage patch by (Nicolas Boos <nicolas.boos at wanadoo dot fr>)

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@3305 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

doc/ffmpeg-doc.texi

@@ -443,8 +443,6 @@ name and its parameters separated by spaces.
 @section Audio Options
 
 @table @option
-@item -ab bitrate         
-set audio bitrate (in kbit/s)
 @item -ar freq    
 set the audio sampling freq (default = 44100 Hz)
 @item -ab bitrate