fix checkstyle rule which has been renamed in last checkstyle versions

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/cli/trunk@1423224 13f79535-47bb-0310-9956-ffa450edef68

Author: olamy

src/conf/checkstyle.xml

@@ -26,8 +26,8 @@ limitations under the License.
     <property name="localeLanguage" value="en"/>
 
     <!-- Checks that a package.html file exists for each package.     -->
-    <!-- See http://checkstyle.sf.net/config_javadoc.html#PackageHtml -->
-    <module name="PackageHtml"/>
+    <!-- See http://checkstyle.sourceforge.net/config_javadoc.html#JavadocPackage -->
+    <module name="JavadocPackage"/>
 
     <!-- Checks whether files end with a new line.                        -->
     <!-- See http://checkstyle.sf.net/config_misc.html#NewlineAtEndOfFile -->