typo in example

Author: ylafon

css-grid/Overview.bs

@@ -261,7 +261,7 @@ Placing Items</h3>
 
 		<pre>
 			grid-row: a;                         grid-column: a;
-			grid-row: auto;                      grid column: auto;
+			grid-row: auto;                      grid-column: auto;
 			grid-row: 2;                         grid-column: 4;
 			grid-row: 1 / -1;                    grid-column: 3;
 			grid-row: header-start / footer-end; grid-column: sidebar-start / footer-end;