message: Explain the registration options a bit better
diff: @@ -78,9 +78,13 @@ homeserver which Matrix events the bridge should receive.
  Execute the following command:
  ```
  -node app.js -r -f appservice-registration-irc.yaml -u "http://where.the.appservice.listens:8090" -c config.yaml -l my_bot
  +node app.js -r -f appservice-registration-irc.yaml -u "http://localhost:8090" -c config.yaml -l my_bot
  ```
  +Change `-u "http://localhost:8090"` to whereever your Matrix server can contact this IRC bridge.
  +By changing the option `-l my_bot` you can modify the localpart of the bridge bot user. It contacts
  +Matrix users of your bridge to control their usage of the bridge (e.g. to change their nickname).
  +
  You should get something like:
  ```
  id: irc
  