[docs] [issue20314] Potentially confusing formulation in 6.1.4. Template strings

[Barry A. Warsaw]

Changes by Barry A. Warsaw <barry at python.org>:


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versions: +Python 3.7 -Python 2.7, Python 3.3, Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20314>
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