[docs] [issue14112] tutorial intro talks of "shallow copy" concept without explanation

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

How about we just like "shallow copy" to the copy module docs.  That way, a person can follow-up with more detail if they're interested, yet still can read-on without interruption if they choose (this entry occurs *very* early in the tutorial).

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<https://bugs.python.org/issue14112>
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