Implement some obvious missing sort orders, from Dane Jensen in GitHub

issue 4813.

tmux.1

@@ -3090,7 +3090,11 @@ See the
 section.
 .Fl O
 specifies the sort order: one of
-.Ql name ,
+.Ql name
+(title),
+.Ql index ,
+.Ql size
+(area),
 .Ql creation
 (time), or
 .Ql activity
@@ -3123,6 +3127,10 @@ section.
 specifies the sort order: one of
 .Ql index ,
 .Ql name ,
+.Ql size
+(area),
+.Ql creation
+(time),
 or
 .Ql activity
 (time).