Remove trailing whitespace

Author: Arkalo2

forms.rst

@@ -996,8 +996,8 @@ The extra fields can be injected like this:
 
 Here, the referral code is an extra field injected at view level.
 
-The field name is composed of form ``user_create`` and the field name ``referralCode``. 
-It's automatically generated from the form class name. You can :ref:`override it <changing-the-form-name>` 
+The field name is composed of form ``user_create`` and the field name ``referralCode``.
+It's automatically generated from the form class name. You can :ref:`override it <changing-the-form-name>`
 
 You can get the referral code via ``getExtraData``::