[css-grid-1] Update Changes list

Author: fantasai

css-grid-1/Overview.bs

@@ -4800,6 +4800,11 @@ Minor Changes</h4>
 						<del>treating <a>flexible tracks</a> as having
 						an infinite <a>growth limit</a>
 			</blockquote>
+			This change is purely editorial; it should have no effect on implementations.
+		<li id="change-2017-template-string-whitespace">
+			Clarified that white space is normalized in 'grid-template-areas' <<string>>values.
+			(<a href="https://github.com/w3c/csswg-drafts/issues/4335">Issue 4335</a>)
+			See [[#serialize-template]].
 	</ul>
 
 <h4 id="clarify-2017">
@@ -4881,6 +4886,25 @@ Clarifications</h4>
 					on the size of the item’s content,
 					it is considered a type of <a>intrinsic size contribution</a>.
 			</blockquote>
+		<li id="change-2017-blockification">
+			Clarified that blockification occurs
+			through intervening elements with ''display: contents'',
+			and does not consider whether the ''grid''/''inline-grid'' element
+			ends up actually generating a [=grid container=] box.
+			(<a href="https://github.com/w3c/csswg-drafts/issues/4065">Issue 4065</a>)
+			<blockquote>
+				<p><del>The 'display' value of a <a>grid item</a> is <a>blockified</a>:
+				if the specified 'display' of an in-flow child of an element generating a <a>grid container</a>
+				is an inline-level value, it computes to its block-level equivalent.</del>
+				<ins>If the [=computed value|computed=] 'display' value of an element's nearest ancestor element
+				(skipping ''display:contents'' ancestors)
+				is ''grid'' or ''inline-gird'',
+				the element's own 'display' value is [=blockified=].</ins>
+
+				Note: <ins>Blockification still occurs even when the ''flex'' or ''inline-flex'' element does not end up generating a [=flex container=] box,
+				e.g. when it is [=replaced element|replaced=]
+				or in a ''display: none'' subtree.</ins>
+			</blockquote>
 	</ul>
 
 <h3 id="changes-2016">