no jira - just comment changes to get by Java 8 javadoc lint checking

git-svn-id: https://svn.apache.org/repos/asf/uima/uimaj/trunk@1646325 13f79535-47bb-0310-9956-ffa450edef68
no Jira, minor updates, clarifications

git-svn-id: https://svn.apache.org/repos/asf/uima/uimaj/trunk@1646330 13f79535-47bb-0310-9956-ffa450edef68