DBCP-400.
Correct the documentation for the maxOpenPreparedStatements parameter and review the use of the phrase non-positive throughout the documentation and javadoc, replacing it with negative where that is the correct definition to use.


git-svn-id: https://svn.apache.org/repos/asf/commons/proper/dbcp/trunk@1557453 13f79535-47bb-0310-9956-ffa450edef68