Update zend.view.helpers.doctype.rst

Added link to viewmanager docs since the usage described here doesn't really work for Zend\Mvc apps.
Update zend.view.helpers.doctype.rst

Updated reference link to not include the text "service"
Merge branch 'patch-1' of git://github.com/dkmuir/zf2-documentation into hotfix/903
Merge branch 'hotfix/903'

Close #903