Small clarification in extending docs.

Author: birkenfeld

Doc/extending/extending.rst

@@ -515,7 +515,7 @@ or more format codes between parentheses.  For example::
 value of the Python function.  :c:func:`PyObject_CallObject` is
 "reference-count-neutral" with respect to its arguments.  In the example a new
 tuple was created to serve as the argument list, which is :c:func:`Py_DECREF`\
--ed immediately after the call.
+-ed immediately after the :c:func:`PyObject_CallObject` call.
 
 The return value of :c:func:`PyObject_CallObject` is "new": either it is a brand
 new object, or it is an existing object whose reference count has been