docs: fix simple typo, organizationt -> organization

There is a small typo in CONTRIB.md.

Should read `organization` rather than `organizationt`.

Author: timgates42

CONTRIB.md

@@ -35,4 +35,4 @@ Follow either of the two links above to access the appropriate CLA and instructi
 1. Clone the README.md, CONTRIB.md and LICENSE files from the GoogleCloudPlatform/Template repo.
 1. Ensure that your code adheres to the existing style in the sample to which you are contributing. Refer to the [Google Cloud Platform Samples Style Guide](https://github.com/GoogleCloudPlatform/Template/wiki/style.html) for the recommended coding standards for this organization.
 1. Ensure that your code has an appropriate set of unit tests which all pass.
-1. Submit a request to fork your repo in GoogleCloudPlatform organizationt via your proposal issue.
+1. Submit a request to fork your repo in GoogleCloudPlatform organization via your proposal issue.