- Fixed several Checkstyle reported warnings/errors.

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1637197 13f79535-47bb-0310-9956-ffa450edef68
MPMD-191: Update to PMD 5.2.1

* Include needed pmd-javascript dependency to example documentation.
* Add dom4j to doxia-site-renderer.

Thanks to Andreas Angel!

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1637198 13f79535-47bb-0310-9956-ffa450edef68