Fix Sphinx warnings in C API doc

Doc/c-api/apiabiversion.rst

@@ -60,7 +60,7 @@ See :ref:`stable` for a discussion of API and ABI stability across versions.
 
    Use this for numeric comparisons, e.g. ``#if PY_VERSION_HEX >= ...``.
 
-   This version is also available via the symbol :data:`Py_Version`.
+   This version is also available via the symbol :c:var:`Py_Version`.
 
 .. c:var:: const unsigned long Py_Version
 

Doc/c-api/arg.rst

@@ -404,7 +404,7 @@
    raises the appropriate exception.
 
 
 .. c:function:: int PyArg_VaParse(PyObject *args, const char *format, va_list vargs)
 
    Identical to :c:func:`PyArg_ParseTuple`, except that it accepts a va_list rather
    than a variable number of arguments.
@@ -424,7 +424,7 @@
       <positional-only_parameter>`.
 
 
 .. c:function:: int PyArg_VaParseTupleAndKeywords(PyObject *args, PyObject *kw, const char *format, char *keywords[], va_list vargs)
 
    Identical to :c:func:`PyArg_ParseTupleAndKeywords`, except that it accepts a
    va_list rather than a variable number of arguments.
@@ -477,7 +477,7 @@
    will be set if there was a failure.
 
    This is an example of the use of this function, taken from the sources for the
-   :mod:`_weakref` helper module for weak references::
+   :mod:`!_weakref` helper module for weak references::
 
       static PyObject *
       weakref_ref(PyObject *self, PyObject *args)
@@ -656,7 +656,7 @@
    If there is an error in the format string, the :exc:`SystemError` exception is
    set and ``NULL`` returned.
 
 .. c:function:: PyObject* Py_VaBuildValue(const char *format, va_list vargs)
 
    Identical to :c:func:`Py_BuildValue`, except that it accepts a va_list
    rather than a variable number of arguments.

Doc/c-api/bool.rst

@@ -13,7 +13,7 @@ are available, however.
 
 .. c:function:: int PyBool_Check(PyObject *o)
 
-   Return true if *o* is of type :c:data:`PyBool_Type`.  This function always
+   Return true if *o* is of type :c:data:`!PyBool_Type`.  This function always
    succeeds.