Use parsed-literal for the slot column legend in c-api/typeobj.rst

Author: Chang-LeHung

Doc/c-api/typeobj.rst

@@ -169,19 +169,19 @@ Quick Reference
 
    **"D"**:  default (if slot is set to ``NULL``)
 
-   .. code-block:: none
+   .. parsed-literal::
 
-      X - PyType_Ready sets this value if it is NULL
-      ~ - PyType_Ready always sets this value (it should be NULL)
-      ? - PyType_Ready may set this value depending on other slots
+      X - :c:func:`PyType_Ready` sets this value if it is ``NULL``
+      ~ - :c:func:`PyType_Ready` always sets this value (it should be ``NULL``)
+      ? - :c:func:`PyType_Ready` may set this value depending on other slots
 
       Also see the inheritance column ("I").
 
    **"I"**:  inheritance
 
-   .. code-block:: none
+   .. parsed-literal::
 
-      X - type slot is inherited via *PyType_Ready* if defined with a *NULL* value
+      X - type slot is inherited via :c:func:`PyType_Ready` if defined with a ``NULL`` value
       % - the slots of the sub-struct are inherited individually
       G - inherited, but only in combination with other slots; see the slot's description
       ? - it's complicated; see the slot's description