[css-contain-1] Correct typo and markup in changes section

Author: frivoal

css-contain-1/Overview.bs

@@ -999,7 +999,7 @@ This appendix is <em>informative</em>.
 
 	<ul>
 		<li>
-			Marked as a <a class=correction href="#c1">Candidate Correction 1</a>:
+			Marked as <a href="#c1">Candidate Correction 1</a>:
 			Rewrote much of the [[#containment-size]] section in more detail
 			to clarify ambiguities about how it is meant to work,
 			and improve the general legibility.