Document Default Interpreter

[Kurt-von-Laven]

The mypy-type-checker.interpreter setting is helpfully documented in the README:

Path to a python interpreter to use to run the linter server.

The default value is [], but it isn't immediately clear what interpreter is used in this case. For instance, is python.defaultInterpreterPath used, or does the mypy extension ship with a Python interpreter?

[karthiknadig]

The python is the one selected in the python extension. We use an API from python extension to get the path to it.

We will update the text.