Added lingering change in dev-docs

- Commenting the seed flag.

docs/Python-API.md

 
 ```python
 from unityagents import UnityEnvironment
-env = UnityEnvironment(file_name="3DBall", worker_id=0)
+env = UnityEnvironment(file_name="3DBall", worker_id=0, seed=1)
+* `seed` indicates the seed to use when generating random numbers during the training process. In environments which do not involve physics calculations, setting the seed enables reproducible experimentation by ensuring that the environment and trainers utilize the same random seed.
 
 ## Interacting with a Unity Environment