[css-content] more reorg

Author: dauwhe

css-content/Overview.bs

@@ -540,7 +540,7 @@ Rendering leaders
 Procedure for rendering leaders
 </h4>
 <ol>
-<li> Lay out the before content, until reaching the line where the before content ends. <pre>
+<li> Lay out the <var>before content</var>, until reaching the line where the <var>before content</var> ends. <pre>
 BBBBBBBBBB
 BBB
 </pre>
@@ -574,7 +574,7 @@ BBBBBB
 
 define your terms  -->
 
-Issue: what to do if after content is wider than the line box?
+Issue: what to do if <var>after content</var> is wider than the line box?
 
 Issue: Leaders don't quite work in table layouts. How can we fix this?