interfaces: consolidate vxlan, geneve, wifi, pppoe, wwan to new include command syntax

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diff --git a/docs/_include/interface-dhcpv6-prefix-delegation.txt b/docs/_include/interface-dhcpv6-prefix-delegation.txt
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+**DHCPv6 Prefix Delegation (PD)**
+
+VyOS 1.3 (equuleus) supports DHCPv6-PD (:rfc:`3633`). DHCPv6 Prefix Delegation
+is supported by most ISPs who provide native IPv6 for consumers on fixed networks.
+
+.. cfgcmd:: set interfaces {{ var0 }} <interface> dhcpv6-option pd <id> length <length>
+
+   Some ISPs by default only delegate a /64 prefix. To request for a specific
+   prefix size use this option to request for a bigger delegation for this pd
+   `<id>`. This value is in the range from 32 - 64 so you could request up to a
+   /32 prefix (if your ISP allows this) down to a /64 delegation.
+
+   The default value corresponds to 64.
+
+  Example:
+
+  To request a /56 prefix from your ISP use:
+
+  .. code-block:: none
+
+    set interfaces {{ var0 }} {{ var1 }} dhcpv6-options pd 0 length 56
+
+.. cfgcmd:: set interfaces {{ var0 }} <interface> dhcpv6-option pd <id> interface <delegatee> address <address>
+
+   Specify the interface address used locally on the interfcae where the prefix
+   has been delegated to. ID must be a decimal integer.
+
+   It will be combined with the delegated prefix and the sla-id to form a
+   complete interface address. The default is to use the EUI-64 address of the
+   interface.
+
+   Example: Delegate a /64 prefix to interface eth0.10 which will use a local
+   address on this router of ``<prefix>::ffff``, as the address 65534 will
+   correspond to ``ffff`` in hexadecimal notation.
+
+  .. code-block:: none
+
+    set interfaces {{ var0 }} {{ var1 }} dhcpv6-option pd 0 interface eth0.10 address 65534
+
+.. cfgcmd:: set interfaces {{ var0 }} <interface> dhcpv6-option pd <id> interface <delegatee> sla-id <id>
+
+   Specify the identifier value of the site-level aggregator (SLA) on the
+   interface. ID must be a decimal number greater then 0 which fits in the
+   length of SLA IDs (see below).
+
+   Example: If ID is 1 and the client is delegated an IPv6 prefix
+   2001:db8:ffff::/48, dhcp6c will combine the two values into a single IPv6
+   prefix, 2001:db8:ffff:1::/64, and will configure the prefix on the specified
+   interface.
+
+  .. code-block:: none
+
+    set interfaces {{ var0 }} {{ var1 }} dhcpv6-option pd 0 interface eth0.10 sla-id 1
+