[css-contain-3] Clarify serialization order of contain values (#8600)

Author: mirisuzanne

css-contain-3/Overview.bs

@@ -80,7 +80,7 @@ Strong Containment: the 'contain' property</h2>
 
 	<pre class='propdef partial'>
 		Name: contain
-		New Values: layout || style || paint || [ size | inline-size ]
+		Value: none | strict | content | [ [size | inline-size] || layout || style || paint ]
 	</pre>
 
 	<dl dfn-type=value dfn-for=contain>
@@ -1116,6 +1116,8 @@ Changes since the 18 August 2022 Working Draft</h3>
 
 	Significant changes since the <a href="https://www.w3.org/TR/2022/WD-css-contain-3-20220818/">18 August 2022 Working Draft</a> include:
 
+	* List all values of 'contain' in order to clarify serialization order
+		(<a href="https://github.com/w3c/csswg-drafts/issues/8600">Issue 8600</a>)
 	* Add the {{CSSContainerRule/containerName}} and
 		{{CSSContainerRule/containerQuery}} attributes.
 		(<a href="https://github.com/w3c/csswg-drafts/issues/7033">Issue 7033</a>)