Vscode-docs: Document that "debugStdlib" is needed to debug 3rd-party code for Python

[brettcannon]

https://code.visualstudio.com/docs/python/debugging#_debugoptions doesn't mention that "debugStdlib" is what it takes to step into 3rd-party code.

/cc @Microsoft/pyvsc as I'm going to be offline starting tomorrow.

[kraigb]

Per @DonJayamanne

Closing as this should not be documented, it's available for a backwards compatibility.
The work in the extension had not yet been finished

Microsoft/vscode-python#2087

[qubitron]

@DonJayamanne @kraigb we need to document how to do this, Don, please add a "justMyCode" setting that is equivalent to debugStdLib if you are hesitant to change the documentation

[DonJayamanne]

@kraigb Lets go with the updates to the documentation for now.
When #2087, we can update the docs accordingly.

[bj00rn]

@kraigb #2087 is now merged. Maybe document this option?

[kraigb]

@JoshuaPartlow This is for you now.

[DonJayamanne]

@kraigb Please do not document debugStdlib, that's been deprecated in favor of justMyCode and that has been documented here https://code.visualstudio.com/docs/python/debugging#_justmycode.

I.e. nothing to do with regards to updating docs.

[kraigb]

Oh, of course. Thanks for the reminder. Closing again.