[css3-ui] update ID on new appendix.

Author: tantek

css-ui/Overview.bs

@@ -1529,7 +1529,7 @@ implemented features.
 </ul>
 
 
-<h2 class="no-num" id="default-style-sheet">Appendix C. Considerations for Security and Privacy</h2>
+<h2 class="no-num" id="security-privacy-considerations">Appendix C. Considerations for Security and Privacy</h2>
 
 This appendix is <em>informative</em>.
 

css-ui/Overview.html

@@ -376,8 +376,8 @@ <h2 class="no-num no-toc no-ref heading settled" id="contents"><span class="cont
      <ul class="toc">
       <li><a href="#changes-list"><span class="secno"></span> <span class="content">List of substantial changes</span></a>
      </ul>
-    <li><a href="#default-style-sheet"><span class="secno"></span> <span class="content">Appendix C. Considerations for Security and Privacy</span></a>
-    <li><a href="#default-style-sheet0"><span class="secno"></span> <span class="content">Appendix D. Default style sheet additions for HTML</span></a>
+    <li><a href="#security-privacy-considerations"><span class="secno"></span> <span class="content">Appendix C. Considerations for Security and Privacy</span></a>
+    <li><a href="#default-style-sheet"><span class="secno"></span> <span class="content">Appendix D. Default style sheet additions for HTML</span></a>
     <li><a href="#test-suite"><span class="secno"></span> <span class="content">Appendix E: Test Suite</span></a>
     <li><a href="#conformance"><span class="secno"></span> <span class="content">
 Conformance</span></a>
@@ -3444,7 +3444,7 @@ <h3 class="no-num heading settled" id="changes-list"><span class="content">List
 
 
 
-   <h2 class="no-num heading settled" id="default-style-sheet"><span class="content">Appendix C. Considerations for Security and Privacy</span><a class="self-link" href="#default-style-sheet"></a></h2>
+   <h2 class="no-num heading settled" id="security-privacy-considerations"><span class="content">Appendix C. Considerations for Security and Privacy</span><a class="self-link" href="#security-privacy-considerations"></a></h2>
 
 
    <p>This appendix is <em>informative</em>.</p>
@@ -3563,7 +3563,7 @@ <h2 class="no-num heading settled" id="default-style-sheet"><span class="content
 </ol>
 
 
-   <h2 class="no-num heading settled" id="default-style-sheet0"><span class="content">Appendix D. Default style sheet additions for HTML</span><a class="self-link" href="#default-style-sheet0"></a></h2>
+   <h2 class="no-num heading settled" id="default-style-sheet"><span class="content">Appendix D. Default style sheet additions for HTML</span><a class="self-link" href="#default-style-sheet"></a></h2>
 
 
    <p>This appendix is <em>informative</em>.</p>