Update iptables.rst

source/getting_started/iptables.rst

@@ -22,7 +22,7 @@ Optional Rules
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 | OPENVPN: ``iptables -A INPUT -p udp --dport 1194 -j ACCEPT`` 
-| ICMP: `` iptables -A INPUT -p icmp --icmp-type echo-request -j ACCEPT``
+| ICMP: ``iptables -A INPUT -p icmp --icmp-type echo-request -j ACCEPT``
 
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