Document Python script examples

[deprit]

The Python scripts in examples/src/armory/examples need to document both the overall structure of the evaluations as individual functions and key details that may escape novice users. We can assume that the reader is an ML engineer who is proficient in Python and neural models and who is learning to use Armory Library.

• Write introductory docstring describing example purpose and structure
• Write docstrings for main functions of the example
• Provide in-line comments for key steps or details.