utimensat.2: Minor fix: reorder some text in NOTES

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

man2/utimensat.2

@@ -447,6 +447,18 @@ and
 .BR utimes (2)
 on Linux.)
 
+If both
+.I tv_nsec
+fields are specified as
+.BR UTIME_OMIT ,
+then the Linux implementation of
+.BR utimensat ()
+succeeds even if the file referred to by
+.IR dirfd
+and
+.I pathname
+does not exist.
+
 On Linux,
 .BR futimens ()
 is a library function implemented on top of the
@@ -467,18 +479,6 @@ is implemented as:
 
     utimensat(fd, NULL, times, 0);
 .fi
-
-If both
-.I tv_nsec
-fields are specified as
-.BR UTIME_OMIT ,
-then the Linux implementation of
-.BR utimensat ()
-succeeds even if the file referred to by
-.IR dirfd
-and
-.I pathname
-does not exist.
 .SH BUGS
 Several bugs afflict
 .BR utimensat ()