Fix the site's source repository link.

Author: Gary Gregory

src/site/xdoc/index.xml

@@ -60,7 +60,7 @@ The Javadoc API documents are available online:
   <li><a href="https://javadoc.io/doc/org.apache.commons/commons-csv/1.0">Javadoc 1.0</a></li>
 </ul>
 <p>
-The <a href="source-repository.html">git repository</a> can be
+The <a href="scm.html">git repository</a> can be
 <a href="https://git-wip-us.apache.org/repos/asf?p=commons-csv.git">browsed</a>.
 </p>
 </section>

src/site/xdoc/mail-lists.xml

@@ -152,7 +152,7 @@ limitations under the License.
           <td>
             <strong>Commons Commits List</strong>
             <br /><br />
-            Only for e-mails automatically generated by the <a href="source-repository.html">source control</a> sytem.
+            Only for e-mails automatically generated by the <a href="scm.html">source control</a> sytem.
             <br /><br />
           </td>
           <td><a href="mailto:commits-subscribe@commons.apache.org">Subscribe</a></td>