Update command line instructions for game server and GUI

The instructions for starting the Overcooked game server and GUI have been updated. They now include manager_ids as extra arguments, which are necessary for proper setup. This changelog is reflected in the __init__.py file of the overcooked_simulator directory.

overcooked_simulator/__init__.py

@@ -35,9 +35,10 @@ _The arguments are the defaults. Therefore, they are optional._
 You can also start the **Game Server** and the **PyGame GUI** individually in different terminals.
 
 ```bash
-python3 overcooked_simulator/game_server.py --url "localhost" --port 8000
+python3 overcooked_simulator/game_server.py --url "localhost" --port 8000 --manager_ids SECRETKEY1 SECRETKEY2
 
-python3 overcooked_simulator/gui_2d_vis/overcooked_simulator.py --url "localhost" --port 8000
+python3 overcooked_simulator/gui_2d_vis/overcooked_gui.py --url "localhost" --port 8000 --manager_ids SECRETKEY1
+```
 
 ## Connect with agent and receive game state
 ...