clarify the python docs and learn.py help message

docs/Python-API.md

 env = UnityEnvironment(file_name=filename, worker_id=0)
 ```
 
-* `file_name` is the name of the environment binary (located in the root directory of the python project). 
+* `file_name` is the name of the environment binary (located in the root directory of the python project), remember to wrap the `file_name` with `""`. 
 * `worker_id` indicates which port to use for communication with the environment. For use in parallel training regimes such as A3C.
 
 ## Interacting with a Unity Environment

python/learn.py

     logger = logging.getLogger("unityagents")
     _USAGE = '''
     Usage:
-      learn (<env>) [options] 
+      learn (<env>) [options]
+      execute with --help to get more information
 
     Options:
       --help                     Show this message.