Change Struct's docstring & add test in test_inspect.py

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

Author: skirpichev

Lib/test/test_inspect/test_inspect.py

@@ -6266,6 +6266,10 @@ def test_stat_module_has_signatures(self):
         import stat
         self._test_module_has_signatures(stat)
 
+    def test_struct_module_has_signatures(self):
+        import struct
+        self._test_module_has_signatures(struct)
+
     def test_string_module_has_signatures(self):
         import string
         self._test_module_has_signatures(string)

Modules/_struct.c

@@ -2440,17 +2440,12 @@ static PyGetSetDef s_getsetlist[] = {
     {NULL} /* sentinel */
 };
 
-PyDoc_STRVAR(s__doc__,
-"Struct(fmt) --> compiled struct object\n"
-"\n"
-);
-
 static PyType_Slot PyStructType_slots[] = {
     {Py_tp_dealloc, s_dealloc},
     {Py_tp_getattro, PyObject_GenericGetAttr},
     {Py_tp_setattro, PyObject_GenericSetAttr},
     {Py_tp_repr, s_repr},
-    {Py_tp_doc, (void*)s__doc__},
+    {Py_tp_doc, (void*)Struct___init____doc__},
     {Py_tp_traverse, s_traverse},
     {Py_tp_clear, s_clear},
     {Py_tp_methods, s_methods},