Fixed white space issues

Author: javiereguiluz

doctrine/registration_form.rst

@@ -87,7 +87,7 @@ With some validation added, your class may look something like this::
          * @ORM\Column(type="string", length=64)
          */
         private $password;
-        
+
         /**
          * @ORM\Column(type="array")
          */
@@ -146,7 +146,7 @@ With some validation added, your class may look something like this::
             // You *may* need a real salt if you choose a different encoder.
             return null;
         }
-        
+
         public function getRoles()
         {
             return $this->roles;
@@ -456,4 +456,3 @@ us to add validation, even though there is no ``termsAccepted`` property on ``Us
 .. _`CVE-2013-5750`: https://symfony.com/blog/cve-2013-5750-security-issue-in-fosuserbundle-login-form
 .. _`FOSUserBundle`: https://github.com/FriendsOfSymfony/FOSUserBundle
 .. _`bcrypt`: https://en.wikipedia.org/wiki/Bcrypt
-