[docs] [issue12092] Clarify sentence in tutorial

[Roundup Robot]

Roundup Robot <devnull at devnull> added the comment:

New changeset c449d3c3e0da by Ezio Melotti in branch '2.7':
#12092: backport rephrasing of a paragraph in the tutorial.
http://hg.python.org/cpython/rev/c449d3c3e0da

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