[css-inline-3] Fix weird markup wrt aliasing w3c#8173

Author: fantasai

css-inline-3/Overview.bs

@@ -854,10 +854,10 @@ Legacy Values for SVG</h5>
 
 	SVG implementations <em>may</em> support the following aliases
 	in order to support legacy content:
-	<pre dfn-for=alignment-baseline dfn-type=value>
-		<dfn>text-before-edge</dfn> = ''alignment-baseline/text-top''
-		<dfn>text-after-edge</dfn> = ''alignment-baseline/text-bottom''
-	</pre>
+	<ul dfn-for=alignment-baseline dfn-type=value>
+		* <dfn>text-before-edge</dfn> aliasing ''alignment-baseline/text-top''
+		* <dfn>text-after-edge</dfn> aliasing ''alignment-baseline/text-bottom''
+	</ul>
 	These values are not allowed in the 'vertical-align' shorthand.
 
 <h4 id="baseline-shift-property">