Fix the site's source repository link.

Author: Gary Gregory

src/site/site.xml

@@ -29,7 +29,7 @@
             <item name="Changes Report"       href="/changes-report.html"/>
             <item name="Mailing Lists"        href="/mail-lists.html"/>
             <item name="Issue Tracking"       href="/issue-tracking.html"/>
-            <item name="Source Repository"    href="/source-repository.html"/>
+            <item name="Source Repository"    href="/scm.html"/>
         </menu>
 
         <menu name="User Guide">