[css-flexbox] inconsistent wording for definite sizing

Hi there!

The flexbox spec has inconsistent requirements for definite sizing. Compare:
https://www.w3.org/TR/css3-flexbox/#algo-stretch
vs
https://www.w3.org/TR/css3-flexbox/#definite-sizes

The former indicates no requirement that the flexbox itself is single-line,
doesn't wrap, etc. My interpretation is that I should follow the second one
only. Is that correct?

Thanks,
-Christian