is this bad documentation?

[Skaperen]

i can't get the documentation quoted here from the 3.5.2 PDF document. but reading the text at 2.4.2 String literal concatenation, it does not say that the concatenation must be in parenthesis in order to concatenate across a line boundary. so it did tests because it thought it was required. it does indeed seem to be required. but the language reference i have for 3.5.2 in PDF format does not say this. it does show an example with parenthesis and that might be enough of a hint. are other version documentation also missing this?