DERBY-6065: LockTable API link in the documentation is broken

Fix to javadoc for java/engine/org/apache/derby/diag/StatementCache.java.

Patch: DERBY-6065-code.diff


git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/trunk@1444154 13f79535-47bb-0310-9956-ffa450edef68