Fixes to manual configuration sample:

 1. Added import statement for clarity
 2. Use ".cloud" instead of ".getCloud()" cause it's groovier.
 3. Removed second argument to "cloud.getServiceInfo()" as spring-cloud
does not seem to have a two argument getServiceInfo method.
 4. Switch 'url' to 'jdbcUrl' which seems to be what
RelationalServiceInfo makes available.