Add cross reference to find

man/man1/valid-utf8.1

@@ -50,7 +50,8 @@ occurs.
 .\" .Sh EXAMPLES
 .\" .Sh DIAGNOSTICS
 .\" For sections 1, 4, 6, 7, 8, and 9 printf/stderr messages only.
-.\" .Sh SEE ALSO
+.Sh SEE ALSO
+.Xr find 1 .
 .\" .Xr foobar 1
 .\" .Sh STANDARDS
 .\" .Sh HISTORY