bpo-38600: NULL -> ``NULL``. (GH-17001)
Also fix some other formatting.
diff --git a/Doc/c-api/tuple.rst b/Doc/c-api/tuple.rst
index d74d862..25df397 100644
--- a/Doc/c-api/tuple.rst
+++ b/Doc/c-api/tuple.rst
@@ -153,7 +153,7 @@
| ``name`` | ``const char *`` | name of the struct sequence type |
+-------------------+------------------------------+--------------------------------------+
| ``doc`` | ``const char *`` | pointer to docstring for the type |
- | | | or NULL to omit |
+ | | | or ``NULL`` to omit |
+-------------------+------------------------------+--------------------------------------+
| ``fields`` | ``PyStructSequence_Field *`` | pointer to ``NULL``-terminated array |
| | | with field names of the new type |
@@ -170,16 +170,16 @@
:attr:`fields` array of the :c:type:`PyStructSequence_Desc` determines which
field of the struct sequence is described.
- +-----------+------------------+----------------------------------------+
- | Field | C Type | Meaning |
- +===========+==================+========================================+
- | ``name`` | ``const char *`` | name for the field or ``NULL`` to end |
- | | | the list of named fields, set to |
- | | | PyStructSequence_UnnamedField to |
- | | | leave unnamed |
- +-----------+------------------+----------------------------------------+
- | ``doc`` | ``const char *`` | field docstring or ``NULL`` to omit |
- +-----------+------------------+----------------------------------------+
+ +-----------+------------------+-----------------------------------------+
+ | Field | C Type | Meaning |
+ +===========+==================+=========================================+
+ | ``name`` | ``const char *`` | name for the field or ``NULL`` to end |
+ | | | the list of named fields, set to |
+ | | | :c:data:`PyStructSequence_UnnamedField` |
+ | | | to leave unnamed |
+ +-----------+------------------+-----------------------------------------+
+ | ``doc`` | ``const char *`` | field docstring or ``NULL`` to omit |
+ +-----------+------------------+-----------------------------------------+
.. c:var:: char* PyStructSequence_UnnamedField