docs: improve the companion documentation

docs/bot-companion.md

@@ -30,7 +30,7 @@ It does this by exposing [additional http endpoints](#endpoints) on the servers
    }
    ```
    **It is not recommended to expose the api port to the internet in an unprotected manner.** Consider protecting the api port using a reverse proxy that
-   supports basic authentication or firewall rule.
+   supports basic authentication or by using a firewall rule.
 5. Start the V Rising server and test if the mod works as expect by running the following command in your
    terminal: `curl http://localhost:25570/v-rising-discord-bot/characters`. Expect status code `200` as soon as the server has fully started.