Removing the word 'simple.'

docs/Training-Curriculum-Learning.md

 the environment will vary. In the case of the Wall Jump environment, what varies
 is the height of the wall. We define this as a `Reset Parameter` in the Academy
 object of our scene, and by doing so it becomes adjustable via the Python API.
-Rather than adjusting it by hand, we will create a simple JSON file which
+Rather than adjusting it by hand, we will create a JSON file which
 describes the structure of the curriculum. Within it, we can specify which
 points in the training process our wall height will change, either based on the
 percentage of training steps which have taken place, or what the average reward