[docs] [issue33953] The DEFAULT_ENTROPY variable used to store the current default random bytes value should be documented for `secrets` module

Change by Cheryl Sabella <cheryl.sabella@gmail.com>: ---------- nosy: +rhettinger versions: -Python 3.6 _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue33953> _______________________________________