[css-contain-1] Avoid accidental dependency on L2 from the changelog

Author: frivoal

css-contain-1/Overview.bs

@@ -1474,7 +1474,7 @@ This appendix is <em>informative</em>.
 
 	A full <a href="https://drafts.csswg.org/css-contain-1/issues-2018-11-cr.html">Disposition of Comments</a> is available.
 
-	* Exclude [=style containment=] from ''contain: strict'' and ''contain: content'', and mark it at risk.
+	* Exclude style containment from ''contain: strict'' and ''contain: content'', and mark it at risk.
 
 <h3 id="2018-05-24-changes">Changes from the
 <a href="https://www.w3.org/TR/2018/CR-css-contain-1-20180524/">Candidate Recommendation of 24 May 2018</a></h3>