[Form] CollectionType uses hardcoded FQCN

Author: HeahDude

reference/forms/types/collection.rst

@@ -54,13 +54,9 @@ in a form. For example, suppose you have an ``emails`` field that corresponds
 to an array of email addresses. In the form, you want to expose each email
 address as its own input text box::
 
-    use Symfony\Component\Form\Extension\Core\Type\CollectionType;
-    use Symfony\Component\Form\Extension\Core\Type\EmailType;
-    // ...
-
-    $builder->add('emails', CollectionType::class, array(
+    $builder->add('emails', 'Symfony\Component\Form\Extension\Core\Type\CollectionType', array(
         // each entry in the array will be an "email" field
-        'entry_type'   => EmailType::class,
+        'entry_type'   => 'Symfony\Component\Form\Extension\Core\Type\EmailType',
         // these options are passed to each "email" type
         'entry_options'  => array(
             'required'  => false,
@@ -294,12 +290,8 @@ as your `entry_type`_ option (e.g. for a collection of drop-down menus),
 then you'd need to at least pass the ``choices`` option to the underlying
 type::
 
-    use Symfony\Component\Form\Extension\Core\Type\CollectionType;
-    use Symfony\Component\Form\Extension\Core\Type\ChoiceType;
-    // ...
-
-    $builder->add('favorite_cities', CollectionType::class, array(
-        'entry_type'   => ChoiceType::class,
+    $builder->add('favorite_cities', 'Symfony\Component\Form\Extension\Core\Type\CollectionType', array(
+        'entry_type'   => 'Symfony\Component\Form\Extension\Core\Type\ChoiceType',
         'entry_options'  => array(
             'choices'  => array(
                 'nashville' => 'Nashville',
@@ -378,13 +370,9 @@ for all entries with the ``entry_options`` option will be used.
 
 .. code-block:: php
 
-    use Symfony\Component\Form\Extension\Core\Type\CollectionType;
-    use Symfony\Component\Form\Extension\Core\Type\TextType;
-    // ...
-
-    $builder->add('tags', CollectionType::class, array(
+    $builder->add('tags', 'Symfony\Component\Form\Extension\Core\Type\CollectionType', array(
         'class' => 'AppBundle\Entity\Tag',
-        'entry_type' => TextType::class,
+        'entry_type' => 'Symfony\Component\Form\Extension\Core\Type\TextType',
         'allow_add' => true,
         'prototype' => true,
         'prototype_data' => 'New Tag Placeholder',