[UIMA-3484] revert previous change - this would break jcasgen for merging.  Need to have an approach which generates javadoc comments, but valid javadoc (for javadoc 8 lint checking)

git-svn-id: https://svn.apache.org/repos/asf/uima/uimaj/trunk@1550293 13f79535-47bb-0310-9956-ffa450edef68