replaced broken link (open-telemetry#2815)

Author: benbo34

CONTRIBUTING.md

@@ -15,7 +15,7 @@ and [**Maintainer**](https://github.com/open-telemetry/community/blob/main/commu
 
 Before you can contribute, you will need to sign the [Contributor License Agreement](https://docs.linuxfoundation.org/lfx/easycla/contributors).
 
-Please also read the [OpenTelemetry Contributor Guide](https://github.com/open-telemetry/community/blob/main/CONTRIBUTING.md).
+Please also read the [OpenTelemetry Contributor Guide](https://github.com/open-telemetry/community/blob/main/guides/contributor/README.md).
 
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