fix incorrect variable

ansible_collections/arista/avd/docs/porting-guides/5.x.x.md

@@ -441,15 +441,15 @@ The description field support templates. See the input variables documentation f
 
 #### Underlay L2 port-channel interfaces
 
-The interface description for the L2 uplink/downlink port-channels changes to `L2_<peer_node_group_or_peer>_<peer_interface>`. Previously the default description was `<peer_node_group_or_uppercase_peer>_Po<peer_channel_group_id>`.
+The interface description for the L2 uplink/downlink port-channels changes to `L2_<peer_node_group_or_peer>_<peer_interface>`. Previously the default description was `<peer_node_group_or_uppercase_peer>_Po<peer_port_channel_id>`.
 The field `peer_node_group_or_peer` will contain the peer's node group name for MLAG pairs or EVPN A/A nodes or the peer's hostname for a single switch.
 
 The port-channels using this are port-channel uplinks.
 
 The descriptions can be reverted manually if needed:
 
 ```diff
-+underlay_l2_port_channel_description: "{peer_node_group_or_uppercase_peer}_Po{peer_channel_group_id}"
++underlay_l2_port_channel_description: "{peer_node_group_or_uppercase_peer}_Po{peer_port_channel_id}"
 ```
 
 The description field support templates. See the input variables documentation for available fields.