[docs] [issue14097] Improve the "introduction" page of the tutorial

Terry J. Reedy <tjreedy@udel.edu> added the comment: I think we should feel free to change 'variable' to 'name', especially in the Intro, if it can be done gracefully in context. In my experience with python-list, the former seems a source of confusion for Python newbies. I try to avoid it when writing about Python. ---------- _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue14097> _______________________________________