[css-multicol] Revert part of a change about formatting contexts #1588
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Stating that the element establishes a new formatting context, without
saying what kind of formatting context it needs to establish is not
specific enough. Also, saying that it must establish a "new" formatting
context is ambiguous or misleading for elements that would establish one
anyway.
The current definition of "becomes a formatting context" is
problematic (see #1457), so we
need to fix it, but it is precisely aimed at solving this: defining what
kind of formatting context to establish for the boxes that wouldn't
otherwise, and being clear about which boxes are fine as is and don't
need to be changed.