Update Zend\ServiceManager service factory example to match code

Zend\ServiceManager\FactoryInterface::createService takes a service locator argument
Merge branch 'hotfix/907'

Close #907
Merge branch 'patch-9' of git://github.com/adamlundrigan/zf2-documentation into hotfix/908
Merge branch 'hotfix/908' into develop

Forward port #908