Discovered some spelling errors

[mzdv]

There might be more, but these ones came up to my mind immediately.

[googlebot]

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

:memo: Please visit https://cla.developers.google.com/ to sign.

Once you've signed, please reply here (e.g. I signed it!) and we'll verify. Thanks.

---

• If you've already signed a CLA, it's possible we don't have your GitHub username or you're using a different email address. Check your existing CLA data and verify that your email is set on your git commits.
• If you signed the CLA as a corporation, please let us know the company's name.

[mzdv]

Signed.

[googlebot]

CLAs look good, thanks!

[justinfagnani]

Thanks!

[mzdv]

No problem, keep up the good work :)