Fixed type in phpDoc
Added explanations in phpDoc return types
Fixed wrong type in phpDoc
Changed 'boolean' to the standard 'bool' in the phpDoc
Merge branch 'hotfix/4074'

Close #4074
Merge pull request #4079 from wryck7/fix-zend-mvc

Some fixes for phpDoc in Zend\Mvc
Merge branch 'hotfix/4079' into develop

Forward port #4079