stat(1): sort flags in the DESCRIPTION section

-x's description should come after -t's description.

MFC after:	1 month
Sponsored by:	Dell EMC Isilon

usr.bin/stat/stat.1

@@ -179,15 +179,15 @@ Display information in
 .Dq shell output
 format,
 suitable for initializing variables.
-.It Fl x
-Display information in a more verbose way as known from some
-.Tn Linux
-distributions.
 .It Fl t Ar timefmt
 Display timestamps using the specified format.
 This format is
 passed directly to
 .Xr strftime 3 .
+.It Fl x
+Display information in a more verbose way as known from some
+.Tn Linux
+distributions.
 .El
 .Ss Formats
 Format strings are similar to