Remove stray obsolete comment. This method has been already implemented.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1459761 13f79535-47bb-0310-9956-ffa450edef68
Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=54732
Fix leak of statements in StatementCache interceptor.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1459769 13f79535-47bb-0310-9956-ffa450edef68