fix typo

[martencassel]

fix typo

Thanks for contributing to gVisor!

gVisor development happens on Gerrit rather than GitHub, so we don't accept pull requests here. Gerrit can be found here: https://gvisor-review.googlesource.com

Please see the contributing guidelines for more information: https://github.com/google/gvisor/blob/master/CONTRIBUTING.md

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[martencassel]

I signed it!

[googlebot]

CLAs look good, thanks!

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