Remove trailing backslashes

"prefix-set" blocks work with line breaks just fine,
probably old macro leftover.
OK job claudio

src/etc/examples/bgpd.conf

@@ -1,4 +1,4 @@
-# $OpenBSD: bgpd.conf,v 1.17 2019/11/30 02:31:12 deraadt Exp $
+# $OpenBSD: bgpd.conf,v 1.18 2020/02/16 20:02:21 kn Exp $
 # example bgpd configuration file, see bgpd.conf(5)
 
 # define our own ASN as a macro
@@ -9,9 +9,9 @@ AS $ASN
 router-id 192.0.2.1
 
 # list of networks that may be originated by our ASN
-prefix-set mynetworks {		\
-	192.0.2.0/24		\
-	2001:db8:abcd::/48	\
+prefix-set mynetworks {
+	192.0.2.0/24
+	2001:db8:abcd::/48
 }
 
 include "/var/db/rpki-client/openbgpd"