NO-JIRA: [Java Broker Docbook] Corrected vhostname typo in HA example vhost configuration. Also moved documentation of <envConfig> element to BDBMessageStore config section as
 it applies generally

merged from trunk r1484763

svn merge -c 1484763 https://svn.apache.org/repos/asf/qpid/trunk/qpid/doc/book/src/java-broker



git-svn-id: https://svn.apache.org/repos/asf/qpid/branches/0.22@1484825 13f79535-47bb-0310-9956-ffa450edef68