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

[Terry J. Reedy]

Terry J. Reedy <tjreedy at 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.

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<http://bugs.python.org/issue14097>
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