added "Annotations" namespace for mongodb

Author: bartrail

Resources/doc/groups.md

@@ -85,7 +85,7 @@ class Group extends BaseGroup
 namespace MyProject\MyBundle\Document;
 
 use FOS\UserBundle\Document\Group as BaseGroup;
-use Doctrine\ODM\MongoDB\Mapping as MongoDB;
+use Doctrine\ODM\MongoDB\Mapping\Annotations as MongoDB;
 
 /**
  * @MongoDB\Document
@@ -170,7 +170,7 @@ class User extends BaseUser
 namespace MyProject\MyBundle\Document;
 
 use FOS\UserBundle\Document\User as BaseUser;
-use Doctrine\ODM\MongoDB\Mapping as MongoDB;
+use Doctrine\ODM\MongoDB\Mapping\Annotations as MongoDB;
 
 /**
  * @MongoDB\Document