[css-grid] Section 6 opening text ends mid-sentence, after "auto-placement"

Hi fantasai & Tab,

Just writing to report a typo in the grid spec, in the opening to
section 6.  Currently, that section ends abruptly, mid-sentence.

It currently ends like so:
  # Once the explicit grid is filled (or if there is no
  # explicit grid) auto-placement

Link: http://dev.w3.org/csswg/css-grid/#implicit-grids

I think there's supposed to be some text after "auto-placement" there.
This looks like a relatively recent typo, introduced in Dec 2014, here:
   https://hg.csswg.org/drafts/rev/14956#l1.18

Thanks,
~Daniel