[css-grid] Update DoC

Author: fantasai

css-grid/issues-wd-20160519.bsi

@@ -195,4 +195,5 @@ Comment:   https://github.com/w3c/csswg-drafts/issues/438
 Response:  https://github.com/w3c/csswg-drafts/issues/438#issuecomment-244473832
 Closed:    Rejected
 Resolved:  https://lists.w3.org/Archives/Public/www-style/2016Sep/0028.html
+Verified:  https://github.com/w3c/csswg-drafts/issues/438#issuecomment-246590484
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