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

[Jim Fasarakis-Hilliard]

Jim Fasarakis-Hilliard added the comment:

Ah, yes, the Ref. Manual, not the devguide, silly mistake.

It definitely isn't a documentation bug (the documentation doesn't state something wrong) as much as I think it might be a slight omission. I really wasn't aware of how strict the tokenizer is with any characters after `\`.

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<http://bugs.python.org/issue29968>
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