Fixed typo

[btroncone]

Fixed typo (removed extra 'to') and added colon to match other steps in global installation instructions.

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[btroncone]

I signed it!

On Sat, Sep 17, 2016, 5:05 AM googlebot notifications@github.com wrote:

Thanks for your pull request. It looks like this may be your first
contribution to a Google open source project. Before we can look at your
pull request, you'll need to sign a Contributor License Agreement (CLA).

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verify. Thanks.

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CLAs look good, thanks!

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