Explain the -m flag in more detail

[cuppajoeman]

I learned how it works from here: https://docs.python.org/3/using/cmdline.html#cmdoption-m

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[github-actions]

This PR is stale because it has been open for 30 days with no activity.

[dlax]

The fact that the current directory is added to sys.path is not specific to -m option, see https://docs.python.org/3/library/sys.html#sys.path. For instance, given the current directory:

.
└── pkg
    ├── __init__.py
    └── mod.py

any python command will find pkg.mod (e.g. pydoc pkg.mod).

As the current wording explicitly refers to sys.path, I believe this is sufficient.

[github-actions]

Closing this stale PR because the CLA is still not signed.