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When installing from Python.org, the `python` command isn't available by default (in favour of `py`). Support using `py` instead. There were issues running `hg` when `python` isn't added to the `PATH`, so the docs are being updated accordingly. Of course, it's still worth supporting `py`-instead-of-`python` workflows for `git` users who won't be impacted by that bug. Differential Revision: https://phabricator.services.mozilla.com/D136286
==== mach ==== Mach (German for *do*) is a generic command dispatcher for the command line. To use mach, you install the mach core (a Python package), create an executable *driver* script (named whatever you want), and write mach commands. When the *driver* is executed, mach dispatches to the requested command handler automatically. To learn more, read the docs in ``docs/``.