[issue32263] Template string docs refer to "normal %-based substitutions"

[Raymond Hettinger]

Change by Raymond Hettinger <raymond.hettinger at gmail.com>:


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versions:  -Python 3.4, Python 3.5, Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32263>
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