[css-contain-2] Bikeshed fixes

Author: frivoal

css-contain-2/Overview.bs

@@ -44,6 +44,7 @@ spec:css-break-3; type:dfn; text:fragmentation context
 spec:css-break-3; type:dfn; text:fragmented flow
 spec:css-sizing-4; type:property; text:contain-intrinsic-size
 spec:intersection-observer; type:dfn; text:intersection root
+spec:css-sizing-3; type:value; for:height; text:auto
 </pre>
 
 <h2 id='intro'>
@@ -516,7 +517,7 @@ Size Containment</h3>
 		</wpt>
 
 		Then,
-		its contents must then be laid out into the [=size-containment/containing box=]'s resolved size normally (including any pseudo-elements),
+		its contents must then be laid out into the [=size containment/containing box=]'s resolved size normally (including any pseudo-elements),
 		i.e. [=size containment=] has no effect in this phase.
 
 		Note: [=size containment=] does not suppress baseline alignment.