[Twisted-Python] Update Getting started with Pip

[Craig Rodrigues]

In the top left-hand section of https://twistedmatrix.com, can someone with
edit permissions to the page change:

$ virtualenv try-twisted
$ . try-twisted/bin/activate
$ pip install twisted[tls]
$ twist --help


to something like:

On Python 2:
    $ python -m virtualenv try-twisted

On Python 3:
    $ python3 -m venv try-twisted

On Python 2 or 3:
     $ . try-twisted/bin/activtate
     $ pip install twisted[tls]
     $ twist --help

At least with base Python 3, using the venv module is preferred:
https://docs.python.org/3/library/venv.html

--
Craig
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