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

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

https://github.com/python/cpython/commit/9f74deba784fc8781d13ed564f69c02ed7c331bb

merged by Warsaw (last March).  It removed the whole phrase, "Instead of the normal %-based substitutions,"  I think the other changes would be more worth backporting, (assuming correct for 3.6, which I believe they are) if anything is.

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nosy: +terry.reedy

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