[css-grid] Fix typo in DoC

Author: fantasai

css-grid/issues-cr-2016.bsi

@@ -82,7 +82,7 @@ Response: https://github.com/w3c/csswg-drafts/issues/507#issuecomment-277084365
 Closed:   Accepted
 ----
 Issue 11.
-Summary:  Clamping should transfer through aspect ration in automatic min size
+Summary:  Clamping should transfer through aspect ratio in automatic min size
 From:     fantasai
 Comment:  https://github.com/w3c/csswg-drafts/issues/767
 Response: https://github.com/w3c/csswg-drafts/issues/767#issuecomment-268107107