Fix typo: authenication -> authentication.

src/etc/services

@@ -1,4 +1,4 @@
-#	$OpenBSD: services,v 1.26 2001/02/08 22:36:06 angelos Exp $
+#	$OpenBSD: services,v 1.27 2001/02/26 19:29:49 aaron Exp $
 #
 # Network services, Internet style
 #
@@ -210,7 +210,7 @@ afs3-fileserver		7000/udp	# AFS fileserver
 afs3-callback       	7001/udp	# AFS callback server
 afs3-prserver       	7002/udp	# AFS protection server
 afs3-vlserver		7003/udp	# AFS volumelocation server
-afs3-kaserver       	7004/udp	# AFS kerberos authenication server
+afs3-kaserver       	7004/udp	# AFS kerberos authentication server
 afs3-volser         	7005/udp	# AFS volume server
 afs3-errors         	7006/udp	# AFS error server ?
 afs3-bos            	7007/udp	# AFS basic over-see server ?