Merge branch 'master' into asymm-envs

docs/Python-API.md

 
 ```python
 from mlagents_envs.environment import UnityEnvironment
+# This is a non-blocking call that only loads the environment.
+# Start interacting with the evironment.
+env.reset()
+behavior_names = env.get_behavior_names()
+...
+**NOTE:** Please read [Interacting with a Unity Environment](#interacting-with-a-unity-environment)
+to read more about how you can interact with the Unity environment from Python.
 
 - `file_name` is the name of the environment binary (located in the root
   directory of the python project).

ml-agents/mlagents/trainers/tests/test_simple_rl.py

         step_size=0.2,
     )
     override_vals = {
-        "max_steps": 750,
+        "max_steps": 1000,
-        "behavioral_cloning": {"demo_path": demo_path, "strength": 1.0, "steps": 1000},
+        "behavioral_cloning": {"demo_path": demo_path, "strength": 1.0, "steps": 1500},
         "reward_signals": {
             "gail": {
                 "strength": 1.0,