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

[Cheryl Sabella]

Change by Cheryl Sabella <cheryl.sabella at gmail.com>:


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nosy: +rhettinger
versions:  -Python 3.6

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33953>
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