Fix typo in CONTRIBUTING.md

[amanjain97]

WHAT

Fixed typo in CONTRIBUTING.md file

Previous

Great, it should be as simple as thus

After

Great, it should be as simple as this

[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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[amanjain97]

@googlebot I signed it!

[googlebot]

CLAs look good, thanks!

ℹ️ Googlers: Go here for more info.

[achew22]

@amanjain97 thanks so much for your contribution!

[johanbrandhorst]

Hey @amanjain97, could you please cherry pick this against v2?