[docs] Remove support of bytes paths in os.scandir() (issue 27998)

[eryksun+pybugs at gmail.com]

http://bugs.python.org/review/27998/diff/18802/Modules/posixmodule.c
File Modules/posixmodule.c (right):

http://bugs.python.org/review/27998/diff/18802/Modules/posixmodule.c#newcode11368
Modules/posixmodule.c:11368: static PyObject *
For consistency, here's this function using PyUnicode_FSDecoder as well:

    static PyObject *
    DirEntry_inode(DirEntry *self)
    {
    #ifdef MS_WINDOWS
        if (!self->got_file_index) {
            PyObject *unicode;
            const wchar_t *path;
            STRUCT_STAT stat;
            int result;

            if (!PyUnicode_FSDecoder(self->path, &unicode))
                return NULL;
            path = PyUnicode_AsUnicode(unicode);
            result = LSTAT(path, &stat);
            Py_DECREF(unicode);

            if (result != 0)
                return path_object_error(self->path);

            self->win32_file_index = stat.st_ino;
            self->got_file_index = 1;
        }
        return PyLong_FromLongLong((long long)self->win32_file_index);
    #else /* POSIX */
    #ifdef HAVE_LARGEFILE_SUPPORT
        return PyLong_FromLongLong((long long)self->d_ino);
    #else
        return PyLong_FromLong((long)self->d_ino);
    #endif
    #endif
    }

http://bugs.python.org/review/27998/