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

[Zachary Ware]

Zachary Ware added the comment:

Thanks for the reviews, Ezio and Andy.  Committed with most of your points addressed, though I did leave out the link to `long` since I could not come up with a good wording for adding it, and `long` is easily findable from `int`.  Also, the link for 'complex numbers' also explains `long`, so it should be easy to find without burdening newbies with another name that they may not need for some time.

Andy: in future, please use the 'review' link to post reviews, it makes it much easier for the patch author to keep track of where your comments are meant to apply, and you can leave comments on multiple versions of a patch if you like.

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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue14097>
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