[css-grid] bikeshed fixes

Author: tabatkins

css-grid/Overview.html

@@ -2875,7 +2875,7 @@ <h2 class="no-num no-ref heading settled heading" id=index><span class=content>
 <li><small>(type), <a href=#typedef-flex title="section 5.1.3">5.1.3</a></small>
 </ul><li>flexible length, <a href=#flexible-length title="section 5.1.3">5.1.3</a>
 <li>free space, <a href=#free-space title="section 5.1.3">5.1.3</a>
-<li>grid<ul><li><small>(dfn), <a href=#grid title="section 2">2</a></small>
+<li>grid<ul><li><small>definition of, <a href=#grid title="section 2">2</a></small>
 <li><small>value for display, <a href=#valuedef-grid title="section 3.1">3.1</a></small>
 <li><small>(property), <a href=#propdef-grid title="section 7">7</a></small>
 </ul><li>grid-area, <a href=#propdef-grid-area title="section 8.2">8.2</a>
@@ -2948,7 +2948,7 @@ <h2 class="no-num no-ref heading settled heading" id=index><span class=content>
 <li>span &amp;&amp; [ &lt;integer&gt; || &lt;ident&gt; ], <a href=#grid-placement-span-int title="section 8.1">8.1</a>
 <li>&lt;string&gt;+, <a href=#valuedef-string title="section 5.2">5.2</a>
 <li>subgrid<ul><li><small>value for grid-template-rows, grid-template-columns, <a href=#valuedef-subgrid title="section 5.1">5.1</a></small>
-<li><small>(dfn), <a href=#subgrid title="section 5.1.4">5.1.4</a></small>
+<li><small>definition of, <a href=#subgrid title="section 5.1.4">5.1.4</a></small>
 </ul><li>&lt;track-breadth&gt;, <a href=#typedef-track-breadth title="section 5.1">5.1</a>
 <li>&lt;track-list&gt;, <a href=#typedef-track-list title="section 5.1">5.1</a>
 <li>track list, <a href=#track-list title="section 5.1">5.1</a>