[docs] [issue30051] Document that the random module doesn't support fork

[Raymond Hettinger]

Raymond Hettinger added the comment:

> os.fork() documentation contains a warning that refers to ssl
> documentation where the use of OpenSSL’s internal random number
> generator in forked processes is documented more detailed. 
> I think the same should be added for the random module.

+1 It is reasonable to extend the docs for os.fork().

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