some spelling fixes from Martynas Venckus

src/include/rpc/svc.h

@@ -1,4 +1,4 @@
-/*	$OpenBSD: svc.h,v 1.9 2004/01/22 21:48:02 espie Exp $	*/
+/*	$OpenBSD: svc.h,v 1.10 2007/11/24 12:59:28 jmc Exp $	*/
 /*	$NetBSD: svc.h,v 1.9 1995/04/29 05:28:01 cgd Exp $	*/
 
 /*
@@ -251,7 +251,7 @@ __END_DECLS
  * Somebody has to wait for incoming requests and then call the correct
  * service routine.  The routine svc_run does infinite waiting; i.e.,
  * svc_run never returns.
- * Since another (co-existant) package may wish to selectively wait for
+ * Since another (co-existent) package may wish to selectively wait for
  * incoming calls or other events outside of the rpc architecture, the
  * routine svc_getreq is provided.  It must be passed readfds, the
  * "in-place" results of a select system call (see select, section 2).