[css-contain] Clean up normative references in preparation for publication

Author: frivoal

css-contain-1/Overview.bs

@@ -19,6 +19,7 @@ Ignored Terms: scrollWidth, scrollHeight, clientWidth, clientHeight
 <pre class="anchors">
 spec: css2; urlPrefix: https://www.w3.org/TR/CSS2/
 	type: property; url: generate.html#propdef-content; text: content
+	type: property; url: visudet.html#propdef-vertical-align; text: vertical-align
 	type: value; for: content; url: generate.html#value-def-open-quote; text: open-quote
 	type: value; for: content; url: generate.html#value-def-close-quote; text: close-quote
 	type: value; for: content; url: generate.html#value-def-no-open-quote; text: no-open-quote
@@ -132,7 +133,7 @@ Strong Containment: the 'contain' property</h2>
 	<span id="contain-applies">This property generally applies to all elements (including [[css-pseudo-4#generated-content]])</span>,
 	although some types of containment have no effect on some elements,
 	as detailed in [[#containment-types]].
-	In addition, in the case of [[SVG11]],
+	In addition, in the case of [[SVG2]],
 	the 'contain' property only applies to <{svg}> elements that have an associated CSS layout box.
 
 	<div class='example'>