Fixes typo in documentation

[schalkventer]

No description provided.

[google-cla]

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).

View this failed invocation of the CLA check for more information.

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[andreban]

@schalkventer Thanks for the PR and happy to merge this, but need the CLA signed before doing it.

[schalkventer]

@andreban Not sure why the CLA test fails. I remember doing it before, and when I attempt again I get the following:

Nevermind I think I had to update my existing one, and not create a new one.

Done:

[andreban]

Thanks for confirming. I forced the CLA bot to run again and it worked. Merging it now.

[andreban]

LGTM, thank you!