CSS Grid Level 1 CR Update

CSS Grid has been updated per WG resolutions with a couple of fixes
(plus some typo fixes and broken reference cleanup), as listed here:
   https://drafts.csswg.org/css-grid/#changes

There's also an open issue I just noticed, filed with proposed edits:
   https://github.com/w3c/csswg-drafts/issues/767

IIRC, in order to republish before the moratorium, we need to resolve
on updating the CR this coming week and send out the notification
immediately after the telecon, so please review and report any problems.

Note that a number of related edits have also been made to CSS Box
Alignment. They also need review (and are a bit more complicated),
however we ave a bit more time for those since it's still WD. (I
don't yet have a changes list compiled for css-align, however you
can always check the changelog. ;)

~fantasai