Fix JavaDoc problems in ClassUtils

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/lang/trunk@1582667 13f79535-47bb-0310-9956-ffa450edef68
Fix typos

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/lang/trunk@1582669 13f79535-47bb-0310-9956-ffa450edef68