fix javadoc warnings

git-svn-id: https://svn.apache.org/repos/asf/click/trunk@1540157 13f79535-47bb-0310-9956-ffa450edef68
Create an entry on FAQ about reflection exceptions: #CLK-792

git-svn-id: https://svn.apache.org/repos/asf/click/trunk@1540170 13f79535-47bb-0310-9956-ffa450edef68
fix typo in method ActionResult name.

git-svn-id: https://svn.apache.org/repos/asf/click/trunk@1540181 13f79535-47bb-0310-9956-ffa450edef68