doc/muxers: sort options for the segment muxer

doc/muxers.texi

@@ -442,8 +442,6 @@ The segment muxer supports the following options:
 @item segment_format @var{format}
 Override the inner container format, by default it is guessed by the filename
 extension.
-@item segment_time @var{t}
-Set segment duration to @var{t} seconds. Default value is 2.
 @item segment_list @var{name}
 Generate also a listfile named @var{name}. If not specified no
 listfile is generated.
@@ -474,6 +472,8 @@ the segment start and end time expressed in seconds.
 @end table
 
 Default value is "flat".
+@item segment_time @var{t}
+Set segment duration to @var{t} seconds. Default value is 2.
 @item segment_wrap @var{limit}
 Wrap around segment index once it reaches @var{limit}.
 @end table