Remove javadoc build warnings.

git-svn-id: https://svn.apache.org/repos/asf/jena/trunk@1446091 13f79535-47bb-0310-9956-ffa450edef68
Remove javadoc build warning.

git-svn-id: https://svn.apache.org/repos/asf/jena/trunk@1446092 13f79535-47bb-0310-9956-ffa450edef68