Swap source.bytes and destination.bytes traffic log mappings

Swapping the values of `source.bytes` and `destination.bytes` in order to align the documentation with the changes implemented in #18525

filebeat/docs/modules/panw.asciidoc

@@ -110,8 +110,8 @@ in ECS that are added under the `panw.panos` prefix:
 | Protocol | network.transport |
 | Action | event.outcome |
 | Bytes | network.bytes |
-| Bytes Sent | client.bytes destination.bytes |
-| Bytes Received | server.bytes source.bytes |
+| Bytes Sent | client.bytes source.bytes |
+| Bytes Received | server.bytes destination.bytes |
 | Packets | network.packets |
 | Start Time | event.start |
 | Elapsed Time | event.duration |
@@ -194,4 +194,4 @@ image::./images/filebeat-panw-threat.png[]
 For a description of each field in the module, see the
 <<exported-fields-panw,exported fields>> section.
 
-:edit_url!:
+:edit_url!: