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

[R. David Murray]

R. David Murray added the comment:

I think you meant "the language reference" rather than "the devguide".  The sentence about the comment is redundant with the preceding line that says that the thing that results in a join is a physical line that ends with a backslash ("that is not part of..."), which is a definitive statement that no characters may follow it.

So, I don't see any doc bug here, unless we want to delete that redundant statement about the comment because it is confusing.  But I doubt we want to do that, as some people will think that a comment is "the same as there being nothing" (despite the statement about "physical line") which it is not.

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nosy: +r.david.murray

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