docs(pterodactyl): added documentation for the topic subcommand

.docs/pterodactyl/configuration.md

@@ -136,6 +136,41 @@ This option determines which server's websocket to connect to. See [Getting Star
 
 Default value: `None`
 
+## `topic`
+
+### `host`
+
+This option determines the hostname of your server that will be used to retrieve server information.
+
+### `port`
+
+This option determines the port of your server that will be used to retrieve server information.
+
+Default value: `25565`
+
+### `text`
+
+This option determines what the channel topic will be set to.
+
+Available placeholders:
+
+- `.$H` - replaced with the server's hostname
+- `.$O` - replaced with the server's port
+
+Available with a Minecraft server:
+
+- `.$I` - replaced with the server's ip address
+- `.$M` - replaced with maximum player count
+- `.$P` - replaced with current online player count
+- `.$V` - replaced with the server's current version
+- `.$D` - replaced with the server's description / message of the day
+
+Default value:
+
+```
+Server IP: .$H\nServer Players: .$P/.$M
+```
+
 ## `url`
 
 This option determines what panel the cog will send requests to. See [Getting Started](getting-started.md#getting-server-information) for more information on this.