Update hash.cpp comment mistype

[caiohamamura]

Changed "Candiate" to "Candidate" in comments

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[caiohamamura]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project (if not, look below for help). Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

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• Your company has a Point of Contact who decides which employees are authorized to participate. Ask your POC to be added to the group of authorized contributors. If you don't know who your Point of Contact is, direct the Google project maintainer to go/cla#troubleshoot (Public version).
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[JayFoxRox]

See #4.

Even when this PR was created, this repository has never been the upstream / place to fix such issues in the master branch. This change should have been submitted to LLVM (where it might be already fixed - I didn't check).