doc/testnet/node: tor guide ports hint added

doc/src/testnet/node.md

@@ -93,6 +93,10 @@ file.
 
 For detailed instructions and configuration options on how to do this,
 follow the [Tor Guide](../misc/nodes/tor-guide.md#configure-network-settings).
+The guide is using `darkirc` port `25552` for seeds and `25551` for
+`torrc` configuration, so in your actual configuration replace them
+with `darkfid` ones, where seeds use port `8343` and `torrc` should
+use port `8342`.
 
 ### Wallet initialization