doc/fftools-common-opts: fix typo (name => named)

fix typo (name => named)

Reviewed-by: Gyan Doshi <ffmpeg@gyani.pro>
Signed-off-by: Jun Zhao <barryjzhao@tencent.com>

doc/fftools-common-opts.texi

@@ -107,11 +107,11 @@ Print detailed information about the muxer named @var{muxer_name}. Use the
 @option{-formats} option to get a list of all muxers and demuxers.
 
 @item filter=@var{filter_name}
-Print detailed information about the filter name @var{filter_name}. Use the
+Print detailed information about the filter named @var{filter_name}. Use the
 @option{-filters} option to get a list of all filters.
 
 @item bsf=@var{bitstream_filter_name}
-Print detailed information about the bitstream filter name @var{bitstream_filter_name}.
+Print detailed information about the bitstream filter named @var{bitstream_filter_name}.
 Use the @option{-bsfs} option to get a list of all bitstream filters.
 @end table