gh-151940: fix Sphinx warnings arising from stable_abi.dat

Doc/c-api/intro.rst

@@ -919,6 +919,22 @@ use them.
    See :pep:`353` for details. ``PY_SSIZE_T_MAX`` is the largest positive value
    of type :c:type:`Py_ssize_t`.
 
+.. c:type:: Py_intptr_t
+
+   A signed integral type such that a legitimate ``void*`` can be cast to
+   :c:type:`Py_intptr_t` and then back to ``void*`` again without loss of
+   information.
+
+   Kept for backwards compatibility; prefer using ``intptr_t`` directly.
+
+.. c:type:: Py_uintptr_t
+
+   An unsigned integral type such that a legitimate ``void*`` can be cast to
+   :c:type:`Py_uintptr_t` and then back to ``void*`` again without loss of
+   information.
+
+   Kept for backwards compatibility; prefer using ``uintptr_t`` directly.
+
 
 .. _api-exceptions:
 

Doc/c-api/weakref.rst

@@ -10,6 +10,9 @@ specific object types which directly implement weak references.  The first is a
 simple reference object, and the second acts as a proxy for the original object
 as much as it can.
 
+.. c:type:: PyWeakReference
+
+   The C structure of the objects used to describe weak references objects.
 
 .. c:function:: int PyWeakref_Check(PyObject *ob)
 

Doc/conf.py

@@ -234,6 +234,22 @@
     ('py:attr', '__wrapped__'),
 ]
 
+# Objects present in the stable_abi.dat but removed from the docs
+# or with suppressed references to them.
+nitpick_ignore += [
+    # pending removal in Python 3.16
+    ('c:data', 'Py_FileSystemDefaultEncodeErrors'),
+    ('c:data', 'Py_FileSystemDefaultEncoding'),
+    ('c:data', 'Py_HasFileSystemDefaultEncoding'),
+    ('c:data', 'Py_UTF8Mode'),
+    # legacy typedefs for sq_slice and sq_ass_slice
+    ('c:type', 'ssizessizeargfunc'),
+    ('c:type', 'ssizessizeobjargproc'),
+    # 'symtable' was exposed by symtable.h but removed in 3.10.
+    # See https://github.com/python/cpython/pull/24910.
+    ('c:type', 'symtable'),
+]
+
 # gh-106948: Copy standard C types declared in the "c:type" domain and C
 # structures declared in the "c:struct" domain to the "c:identifier" domain,
 # since "c:function" markup looks for types in the "c:identifier" domain. Use