[css3-grid-layout] Remove lingering instance of the old repeat syntax.

Author: tabatkins

css3-grid-layout/Overview.html

@@ -1269,7 +1269,6 @@ <h3 id=track-sizing><span class=secno>5.1. </span> Track Sizing: the ‘<a
 /* examples of valid track definitions */
 grid-definition-rows: 1fr minmax(min-content, 1fr);
 grid-definition-rows: 10px repeat(2, 1fr auto minmax(30%, 1fr));
-grid-definition-rows: (10px);
 grid-definition-rows: calc(4em - 5px)</pre>
   </div>
 

css3-grid-layout/Overview.src.html

@@ -911,7 +911,6 @@ <h3 id='track-sizing'>
 /* examples of valid track definitions */
 grid-definition-rows: 1fr minmax(min-content, 1fr);
 grid-definition-rows: 10px repeat(2, 1fr auto minmax(30%, 1fr));
-grid-definition-rows: (10px);
 grid-definition-rows: calc(4em - 5px)</pre>
 	</div>
 
@@ -998,7 +997,7 @@ <h4 id='fr-unit'>
 Flexible Lengths: the ''fr'' unit</h4>
 
 	<p>
-		<dfn id="fraction-values">Fraction values</dfn> are new units applicable to the 'grid-definition-rows' and 'grid-definition-columns' properties:
+		<dfn>Fraction values</dfn> are new units applicable to the 'grid-definition-rows' and 'grid-definition-columns' properties:
 
 	<dl>
 		<dt>fr