fixed typos in the docs

doc/cookbook/form_no_csrf.rst

@@ -3,10 +3,10 @@ Disabling CSRF Protection on a Form using the FormExtension
 
 The *FormExtension* provides a service for building form in your application
 with the Symfony Form component. When the `CSRF Service Provider
-</providers/csrf.rst>` is registered, the *FormExtension* uses the CSRF
-Protection avoiding Cross-site request forgery, a method by which a malicious
-user attempts to make your legitimate users unknowingly submit data that they
-don't intend to submit.
+</providers/csrf>` is registered, the *FormExtension* uses the CSRF Protection
+avoiding Cross-site request forgery, a method by which a malicious user
+attempts to make your legitimate users unknowingly submit data that they don't
+intend to submit.
 
 You can find more details about CSRF Protection and CSRF token in the
 `Symfony Book

doc/providers/form.rst

@@ -187,7 +187,7 @@ You can register form type guessers by extending ``form.type.guessers``::
 .. warning::
 
     CSRF protection is only available and automatically enabled when the `CSRF
-    Service Provider </providers/csrf.rst>` is registered.
+    Service Provider </providers/csrf>` is registered.
 
 Traits
 ------

doc/providers/twig.rst

@@ -138,7 +138,7 @@ Rendering a Controller
 ~~~~~~~~~~~~~~~~~~~~~~
 
 A ``render`` function is also registered to help you render another controller
-from a template (available when the `HttpFragment Service Provider </providers/http_fragment.rst>`
+from a template (available when the `HttpFragment Service Provider </providers/http_fragment>`
 is registered):
 
 .. code-block:: jinja