doc/muxers/segment: fix formatting of segment_list_type option

Place @item entry at the right point, remove duplicated description.

doc/muxers.texi

@@ -964,13 +964,6 @@ Allow caching (only affects M3U8 list files).
 Allow live-friendly file generation.
 @end table
 
-@item segment_list_type @var{type}
-Select the listing format.
-@table @option
-@item @var{flat} use a simple flat list of entries.
-@item @var{hls} use a m3u8-like structure.
-@end table
-
 @item segment_list_size @var{size}
 Update the list file so that it contains at most @var{size}
 segments. If 0 the list file will contain all the segments. Default
@@ -980,6 +973,9 @@ value is 0.
 Prepend @var{prefix} to each entry. Useful to generate absolute paths.
 By default no prefix is applied.
 
+@item segment_list_type @var{type}
+Select the listing format.
+
 The following values are recognized:
 @table @samp
 @item flat