Update rand.erl Documentation bug: exs928ss does not work, perhaps ex…

[Koistinen]

My first attempt at contributing.
I tried the code in the documentation and it did not work with Erlang/OTP 24 [erts-12.2.1] [source] [64-bit] [smp:16:16] [ds:16:16:10] [async-threads:1] [jit].
Tested it with Erlang/OTP 27 and that did not work either.
Changing it at least ran and I got random numbers but not starting with a fixed PRNG.
(Got different random numbers each time despite calling seed with an algorithm and a seed.)

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CT Test Results

    2 files     95 suites   36m 26s ⏱️
2 147 tests 2 099 ✅ 48 💤 0 ❌
2 456 runs  2 406 ✅ 50 💤 0 ❌

Results for commit 8af1b0e.

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[RaimoNiskanen]

@Koistinen The change looks perfectly right, and I wouldn't mind if you rebased this to 'maint' so it can be fixed in OTP 27.1.

And it works for me:

Erlang/OTP 27 [erts-15.0.1] [source-50cc3be786] [64-bit] [smp:8:8] [ds:8:8:10] [async-threads:1] [jit:ns]

Eshell V15.0.1 (press Ctrl+G to abort, type help(). for help)
1> rand:seed(exro928ss, {123, 123534, 345345}), ok.
ok
2> rand:uniform().
0.9605668553593557
3> rand:uniform().
0.9614947236922335
4> rand:uniform().
0.24859899775400773
5> rand:seed(exro928ss, {123, 123534, 345345}), ok.
ok
6> rand:uniform().
0.9605668553593557
7> rand:uniform().
0.9614947236922335
8> rand:uniform().
0.24859899775400773

[RaimoNiskanen]

I merged the fix into 'maint' and 'master'.

Thank you for your contribution!