math/rand: fix typo in comment

[toasa]

Fix a case of identifier rngCooked into lower camel case.

We do not have the variable of rng_cooked in golang. On the other hand, the rngCooked is defined here.

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Message from Alberto Donizetti:

Patch Set 1: Code-Review+1 Trust+1

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Message from Ian Lance Taylor:

Patch Set 1: Code-Review+2

(1 comment)

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Message from Ian Lance Taylor:

Patch Set 2: Commit message was updated.

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This PR is being closed because golang.org/cl/281373 has been merged.