correct the typos (GH-4950) (#4951)

(cherry picked from commit 83cb778b)

Modules/_cursesmodule.c

@@ -1365,7 +1365,7 @@ PyCursesWindow_InsCh(PyCursesWindowObject *self, PyObject *args)
         use_xy = TRUE;
         break;
     default:
-        PyErr_SetString(PyExc_TypeError, "insch requires 1 or 4 arguments");
+        PyErr_SetString(PyExc_TypeError, "insch requires 1 to 4 arguments");
         return NULL;
     }
 
@@ -1396,7 +1396,7 @@ PyCursesWindow_InCh(PyCursesWindowObject *self, PyObject *args)
         rtn = mvwinch(self->win,y,x);
         break;
     default:
-        PyErr_SetString(PyExc_TypeError, "inch requires 0 or 2 arguments");
+        PyErr_SetString(PyExc_TypeError, "inch requires 0 to 2 arguments");
         return NULL;
     }
     return PyLong_FromUnsignedLong(rtn);