[css-ruby-1] Retitle appendices to more clearly separate default UA style sheet from author style sheets. w3c#762

Author: fantasai

css-ruby-1/Overview.bs

@@ -1517,12 +1517,12 @@ Ruby annotation spanning: the 'ruby-span' property</h3>
 -->
 
 <h2 id="default-stylesheet" class="no-num">
-Appendix A: Default Style Sheet</h2>
+Appendix A: Sample Style Sheets</h2>
 
 	<em>This section is informative.</em>
 
 <h3 id="default-ua-ruby" class="no-num">
-<span class="secno">A.1</span> Supporting Ruby Layout</h3>
+<span class="secno">A.1</span> Default UA Style Sheet</h3>
 
 	The following represents a default UA style sheet
 	for rendering HTML and XHTML ruby markup as ruby layout: