[css-grid] Added more changes.

Author: tabatkins

css-grid/Overview.html

@@ -2564,6 +2564,8 @@ <h2 class=no-num id=changes><span class=content>
 		<li>Removed the "none" value from <a class=property data-link-type=propdesc href=#propdef-grid-auto-flow title=grid-auto-flow>grid-auto-flow</a>, turning auto-placement on by default so that grid items by default don't stack on top of each other.
 		<li>Made named grid areas <a href=#implict-named-lines>imply named grid lines</a>.
 		<li>Added the <a class=property data-link-type=propdesc href=#propdef-grid-auto title=grid-auto>grid-auto</a> shorthand.
+		<li>Added an option for dense packing to <a class=property data-link-type=propdesc href=#propdef-grid-auto-flow title=grid-auto-flow>grid-auto-flow</a>.
+		<li>Redesigned <a class=css data-link-type=maybe href=#valuedef-subgrid>subgrid</a> feature.
 	</ul>
 
 <h2 class="no-ref no-num" id=conformance><span class=content>

css-grid/Overview.src.html

@@ -2609,4 +2609,6 @@ <h2 class="no-num" id="changes">
 		<li>Removed the "none" value from 'grid-auto-flow', turning auto-placement on by default so that grid items by default don't stack on top of each other.
 		<li>Made named grid areas <a href="#implict-named-lines">imply named grid lines</a>.
 		<li>Added the 'grid-auto' shorthand.
+		<li>Added an option for dense packing to 'grid-auto-flow'.
+		<li>Redesigned ''subgrid'' feature.
 	</ul>