[contain-3][editorial] Document change to container-name computed value #7181

Author: mirisuzanne

css-contain-3/Overview.bs

@@ -1028,6 +1028,8 @@ Changes since the 21 December 2021 First Public Working Draft</h3>
 
 	Significant changes since the <a href="https://www.w3.org/TR/2021/WD-css-contain-3-20211221/">21 December 2021 First Public Working Draft</a> include:
 
+	* Allow the computed value of 'container-name' to include duplicate identifiers.
+		(<a href="https://github.com/w3c/csswg-drafts/issues/7181">Issue 7181</a>)
 	* Make the <<'container-name'>> in the 'container' shorthand required.
 		(<a href="https://github.com/w3c/csswg-drafts/issues/7142">Issue 7142</a>)
 	* Clarify handling of [=shorthand properties=] in [=container style queries=].