Merge pull request w3c#7731 from tiaanl/fix-grid-spelling-mistake

[css-grid-2] Fix simple spelling mistake

Author: astearns

css-grid-2/Overview.bs

@@ -910,7 +910,7 @@ Establishing Grid Containers: the ''display/grid'' and ''inline-grid'' 'display'
 
 		<dt><dfn>inline-grid</dfn>
 		<dd>
-			This value causes an element to generate an <a>grid container</a> box
+			This value causes an element to generate a <a>grid container</a> box
 			that is <a>inline-level</a> when placed in <a>flow layout</a>.
 	</dl>