Minor fixes

Author: javiereguiluz

reference/configuration/twig.rst

@@ -112,7 +112,7 @@ called to determine the default escaping applied to the template.
 base_template_class
 ~~~~~~~~~~~~~~~~~~~
 
-**type**: ``string`` **default**: ``Twig\Template``
+**type**: ``string`` **default**: ``'Twig\Template'``
 
 Twig templates are compiled into PHP classes before using them to render
 contents. This option defines the base class from which all the template classes

reference/forms/types/collection.rst

@@ -324,7 +324,7 @@ type::
 entry_type
 ~~~~~~~~~~
 
-**type**: ``string`` **default**: ``Symfony\Component\Form\Extension\Core\Type\TextType``
+**type**: ``string`` **default**: ``'Symfony\Component\Form\Extension\Core\Type\TextType'``
 
 This is the field type for each item in this collection (e.g. ``TextType``,
 ``ChoiceType``, etc). For example, if you have an array of email addresses,