DERBY-6237 (PreparedStatement.execute() fails starting 10.2 when multiple rows are updated and PreparedStatement.setCharacterStream(int, Reader, int) is used)

Fixing javadoc warning and comment



git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/branches/10.6@1489477 13f79535-47bb-0310-9956-ffa450edef68