[issue31640] Document exit() from parse_args

paul j3 added the comment: And the actual exit is via `parse.error` and `parse.exit`, which are documented in 16.4.5.9. When run interactively in Ipython, exits (including the help) are captured and displayed with: In [896]: parser.parse_args() usage: ipython3 [-h]

[issue31640] Document exit() from parse_args

R. David Murray added the comment: I think this is reasonable, but do note that this is covered in 16.4.4.2, and the fact that help exits is actually a property of help, not parse_args. That is, the docs are correct and complete as they stand, but I agree that it would

[issue31640] Document exit() from parse_args

New submission from Charles Merriam : It is unexpected to testers and users to ArgParse that it terminates the process; one usually expects an error code. Fix by modifying documentation to section 16.4.4 The parse_args() Method. Change the words "Return the