Add SEE ALSO section, as with the other string functions.

Submitted by:	dcs

lib/libc/string/strsep.3

@@ -92,6 +92,17 @@ for (ap = argv; (*ap = strsep(&inputstring, " \et")) != NULL;)
 		if (++ap >= &argv[10])
 			break;
 .Ed
+.Sh SEE ALSO
+.Xr index 3 ,
+.Xr memchr 3 ,
+.Xr rindex 3 ,
+.Xr strchr 3 ,
+.Xr strcspn 3 ,
+.Xr strpbrk 3 ,
+.Xr strrchr 3 ,
+.Xr strspn 3 ,
+.Xr strstr 3 ,
+.Xr strtok 3
 .Sh HISTORY
 The
 .Fn strsep