Fix Javadoc syntax warning from Eclipse
Possibly not necessary, but does no harm to fix it

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/compress/trunk@1573047 13f79535-47bb-0310-9956-ffa450edef68
Generics

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/compress/trunk@1573049 13f79535-47bb-0310-9956-ffa450edef68