Fixed typos on lines 133 and 157

[naclcaleb]

I also changed the wording on line 169 to be a bit more intuitive

Reference Issue

[googlebot]

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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[naclcaleb]

I signed the CLA just now

[googlebot]

CLAs look good, thanks!

[TimvdLippe]

Thanks! Just waiting for CI to finish before merging.