update as per comments

docs/Learning-Environment-Design.md

 
 In some games, it may be desirable to step the environment with the Academy manually via `Academy.Instance.EnvironmentStep()`.
 If this is the case, be sure `Academy.Instance.EnvironmentStep()` is not called directly or indirectly by the agent's
-`CollectObservations()` function as this will cause an infinite loop that prevents that main Academy update function from being called.
+API e.g. from the `CollectObservations()`, `OnActionReceived`, and `Heuristic()` functions as this will
+cause an infinite loop that prevents the main Academy update function from being called.
 
 ### Multiple Areas