[docs] [issue29968] Document that no characters are allowed to proceed \ in explicit line joining

[Jim Fasarakis-Hilliard]

Jim Fasarakis-Hilliard added the comment:

Gotcha, thanks for the input, David. I'll leave it to you to decide if the sentence on the trailing comments warrants removal.

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resolution:  -> rejected
stage:  -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29968>
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