[css-grid] Fix markup

Author: fantasai

css-grid/Overview.bs

@@ -130,9 +130,9 @@ Overview</h2>
 
 	Grid Layout features
 	fixed, flexible, and content-based <a href="#track-sizing">track sizing functions</a>;
-	<a href="#placement">explicit item positioning</a> via forwards (positive) and backwards(negative) numbered grid coordinates,
+	<a href="#placement">explicit item positioning</a> via forwards (positive) and backwards(negative) numerical grid coordinates,
 	named grid lines, and named grid areas;
-	automatic item placement into empty slots, including <a href="#order-property">reordering with <css>order</css>;
+	automatic item placement into empty slots, including <a href="#order-property">reordering with <css>order</css></a>;
 	automatic addition of rows or columns to accommodate additional content;
 	control over alignment and spacing with
 	<a href="#auto-margins">margins</a>, <a>gutters</a>, and the <a href="http://www.w3.org/TR/css-align/">alignment properties</a>;