[docs] [issue21125] traceback.extract_tb says "quadruple" when it means "tuple"

[Roundup Robot]

Roundup Robot added the comment:

New changeset dfa399e74fcf by Raymond Hettinger in branch '3.4':
Issue 21125: minor documentation tweak.
http://hg.python.org/cpython/rev/dfa399e74fcf

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<http://bugs.python.org/issue21125>
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