make usage consistant with manpage

Reference: /n/sources/patch/applied/replica-pull-usage
Date: Wed Feb 15 12:17:36 CET 2006

--- /rc/bin/replica/pull	Wed Feb 15 12:17:21 2006
+++ /rc/bin/replica/pull	Wed Feb 15 12:17:18 2006
@@ -3,7 +3,7 @@
 rfork en
 
 fn usage {
-	echo 'usage: replica/pull [-csnv] replica-name [paths]' >[1=2]
+	echo 'usage: replica/pull [-nv] [-c name] [-s name] replica-name [paths]' >[1=2]
 	exit usage
 }