changed path to contributing guide url in contributing.md (open-telemetry#4130)

Author: LavGupta01

CONTRIBUTING.md

@@ -12,7 +12,7 @@ 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).
 
 # Find your right repo