Typo and Incorrect Variable name

Fixes minor typo and also incorrect reference to variable name

Author: gdevanla

doc/sphinx/source/refcount.rst

@@ -40,7 +40,7 @@ Here is an example of a normal ``PyObject`` creation and deallocation:
  PyObject *pObj = NULL;
  
  pObj = PyBytes_FromString("Hello world\n"); /* Object creation, ref count = 1. */
- PyObject_Print(pLast, stdout, 0); 
+ PyObject_Print(pObj, stdout, 0); 
  Py_DECREF(pObj); /* ref count becomes 0, object deallocated.
  * Miss this step and you have a memory leak. */
  }
@@ -64,7 +64,7 @@ Taking the above example of a normal ``PyObject`` creation and deallocation then
  #include "Python.h"
  
  void print_hello_world(void) {
- PyObject *pObj = NULL:
+ PyObject *pObj = NULL;
  
  pObj = PyBytes_FromString("Hello world\n"); /* Object creation, ref count = 1. */
  PyObject_Print(pLast, stdout, 0);