revising examples

Author: howcome

css-gcpm/Overview.src.html

@@ -453,12 +453,12 @@ <h4>Using named strings</h4>
 </pre>
 </div>
 
-
+<div class="example">
 <pre>
 @page { @top-left { content: string(term, first) }}
 @page { @top-right { content: string(term, last) }}
 @page { @top-center { content: string(index, first) }}
-dt { string-set: index first-letter, term content() }
+dt { string-set: index content(first-letter), term content(text) }
 </pre>
 </div>