Fix the usage error I introduced in r344192.

Specifically, I put the new option line in the wrong place, and then fixed
up the rest without realizing it.  This puts the usage statement back to
what it was, with an additional line for the new -V option.

Reported by:	mav
Sponsored by:	iXsystems Inc.

usr.sbin/nfsd/nfsd.c

@@ -189,9 +189,9 @@ main(int argc, char **argv)
 	    "usage:\n"
 	    "  nfsd [-ardtue] [-h bindip]\n"
 	    "       [-n numservers] [--minthreads #] [--maxthreads #]\n"
-	    "       [-p/--pnfs dsserver0:/dsserver0-mounted-on-dir,...,\n"
-	    "       [-V virtual_hostname]\n"
-	    "       dsserverN:/dsserverN-mounted-on-dir] [-m mirrorlevel]\n";
+	    "       [-p/--pnfs dsserver0:/dsserver0-mounted-on-dir,...,"
+	    "dsserverN:/dsserverN-mounted-on-dir] [-m mirrorlevel]\n"
+	    "       [-V virtual_hostname]\n";
 	while ((ch = getopt_long(argc, argv, getopt_shortopts, longopts,
 		    &longindex)) != -1)
 		switch (ch) {