Update REFERENCE.md

Add `table` parameter documentation into REFERENCE.md

REFERENCE.md

@@ -196,6 +196,7 @@ The following parameters are available in the `wireguard::interface` defined typ
 * [`input_interface`](#-wireguard--interface--input_interface)
 * [`manage_firewall`](#-wireguard--interface--manage_firewall)
 * [`dport`](#-wireguard--interface--dport)
+* [`table`](#-wireguard--interface--table)
 * [`firewall_mark`](#-wireguard--interface--firewall_mark)
 * [`source_addresses`](#-wireguard--interface--source_addresses)
 * [`destination_addresses`](#-wireguard--interface--destination_addresses)
@@ -256,6 +257,14 @@ destination for firewall rules / where our wg instance will listen on. defaults
 
 Default value: `Integer(regsubst($title, '^\D+(\d+)$', '\1'))`
 
+##### <a name="-wireguard--interface--table"></a>`table`
+
+Data type: `Optional[String[1]]`
+
+Routing table to add routes to
+
+Default value: `undef`
+
 ##### <a name="-wireguard--interface--firewall_mark"></a>`firewall_mark`
 
 Data type: `Optional[Integer[0, 4294967295]]`