bug #6320 Fixed typo in path (timhovius)

This PR was submitted for the 2.8 branch but it was merged into the 2.7 branch instead (closes #6320).

Discussion
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Fixed typo in path

The path in the config.yml is wrong and causes an error

Commits
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ff32bd8 Changed folder name to lowercase (best practises)
a66c49a Fixed typo in path

Author: weaverryan

cookbook/form/create_custom_field_type.rst

@@ -115,7 +115,7 @@ link for details), create a ``gender_widget`` block to handle this:
 
     .. code-block:: html+twig
 
-        {# app/Resources/views/Form/fields.html.twig #}
+        {# app/Resources/views/form/fields.html.twig #}
         {% block gender_widget %}
             {% spaceless %}
                 {% if expanded %}
@@ -136,7 +136,7 @@ link for details), create a ``gender_widget`` block to handle this:
 
     .. code-block:: html+php
 
-        <!-- app/Resources/views/Form/gender_widget.html.php -->
+        <!-- app/Resources/views/form/gender_widget.html.php -->
         <?php if ($expanded) : ?>
             <ul <?php $view['form']->block($form, 'widget_container_attributes') ?>>
             <?php foreach ($form as $child) : ?>