[css-grid] Update DoC

Author: fantasai

css-grid/issues-wd-20150917.bsi

@@ -233,5 +233,5 @@ From:     Manuel Rego Casasnovas
 Comment:  https://lists.w3.org/Archives/Public/www-style/2016Jan/0063.html
 Response: https://lists.w3.org/Archives/Public/www-style/2016Jan/0123.html
 Closed:   Accepted
-Resolved: =WG= Discuss.
+Resolved: https://lists.w3.org/Archives/Public/www-style/2016Jan/0279
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