Fix code block in docs for Using custom OneToOneFields

Author: bheesham

AUTHORS.rst

@@ -18,6 +18,7 @@ Authors
 - Amartis Gladius (`Amartis <https://github.com/amartis>`_)
 - Ben Lawson (`blawson <https://github.com/blawson>`_)
 - Benjamin Mampaey (`bmampaey <https://github.com/bmampaey>`_)
+- Bheesham Persaud (`bheesham <https://github.com/bheesham>`_)
 - `bradford281 <https://github.com/bradford281>`_
 - Brian Armstrong (`barm <https://github.com/barm>`_)
 - Buddy Lindsey, Jr.

docs/common_issues.rst

@@ -262,8 +262,6 @@ Using custom OneToOneFields
 If you are using a custom OneToOneField that has additional arguments and receiving
 the the following ``TypeError``::
 
-.. code=block:: python
-
     TypeError: __init__() got an unexpected keyword argument
 
 This is because Django Simple History coerces ``OneToOneField`` into ``ForeignKey``