minor fixes

Author: kumaraditya303

Doc/c-api/object.rst

@@ -802,16 +802,16 @@ Object Protocol
 
    .. versionadded:: 3.14
 
-.. c:function:: int PyUnstable_SetImmortal(PyObject *obj)
+.. c:function:: int PyUnstable_SetImmortal(PyObject *op)
 
-   Marks the object op immortal. The argument should be uniquely referenced by
+   Marks the object *op* immortal. The argument should be uniquely referenced by
    the calling thread.
 
    This is a one-way process: objects can only be made immortal, they cannot be
    made mortal once again. Immortal objects do not participate in reference counting
    and will never be garbage collected.
 
-   This function is intended to be used soon after op is created, by the code that
+   This function is intended to be used soon after *op* is created, by the code that
    creates it, such as in the object's tp_new slot.
    Returns 1 if the object was made immortal and returns 0 if it was not.
    This function cannot fail.