minor symfony#8261 Update resources.rst (afurculita)

This PR was submitted for the 3.3 branch but it was merged into the 2.7 branch instead (closes symfony#8261).

Discussion
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Update resources.rst

`ClassMetadataFactory` has been removed in favor of `LazyLoadingMetadataFactory`. `MetadataFactoryInterface` has been moved to `Mapping\Factory`

Commits
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f689b9b Update resources.rst

Author: xabbuh

components/validator/resources.rst

@@ -179,14 +179,14 @@ Using a Custom MetadataFactory
 ------------------------------
 
 All the loaders and the cache are passed to an instance of
-:class:`Symfony\\Component\\Validator\\Mapping\\ClassMetadataFactory`. This
-class is responsible for creating a ``ClassMetadata`` instance from all the
+:class:`Symfony\\Component\\Validator\\Mapping\\Factory\\LazyLoadingMetadataFactory`. 
+This class is responsible for creating a ``ClassMetadata`` instance from all the
 configured resources.
 
 You can also use a custom metadata factory implementation by creating a class
 which implements
-:class:`Symfony\\Component\\Validator\\MetadataFactoryInterface`. You can set
-this custom implementation using
+:class:`Symfony\\Component\\Validator\\Mapping\\Factory\\MetadataFactoryInterface`. 
+You can set this custom implementation using
 :method:`Symfony\\Component\\Validator\\ValidatorBuilder::setMetadataFactory`::
 
     use Acme\Validation\CustomMetadataFactory;