lime-example: disable lime-hwd-openwrt-wan on custom WAN configuration

Author: ilario

packages/lime-docs/files/www/docs/lime-example.txt

@@ -315,7 +315,8 @@ config net wirelessclientbackbone
 
 ## configure the ethernet port eth1.5 as WAN with static ipv4 and ipv6 addresses 
 
-config net port5                                        # Do not put any "." in the section name
+config net lm_hwd_openwrt_wan                           # Do not put any "." in the section name. Specifying lm_hwd_openwrt_wan will overwrite the configuration automatically generated by lime-hwd-openwrt-wan
+    option autogenerated 'false'                        # This tells lime-hwd-openwrt-wan to not destroy and rewrite this section
     option linux_name 'eth1.5'                          # Put here the actual name of the interface
 #   list protocols 'wan'                                # Use 'wan' instead of 'static' to get Internet connectivity via DHCP
                                                         # If a VLAN is needed on the WAN interface for connecting to the gateway, it can be specified with wan:ID, like "wan:20" or "wan:20:8021q"