Fixed link to cloud-startup

Author: fsschneider

docs/CONTRIBUTING.md

@@ -47,7 +47,7 @@ We recommmend to use the Deep Learning on Linux image. Further instructions are
 
 ### Installing GPU Drivers
 
-You can use the `scripts/cloud-startup.sh` as a startup script for the VM. This will automate the installation of the NVIDIA GPU Drivers and NVIDIA Docker toolkit.
+You can use the `docker/scripts/cloud-startup.sh` as a startup script for the VM. This will automate the installation of the NVIDIA GPU Drivers and NVIDIA Docker toolkit.
 
 ### Authentication for Google Cloud Container Registry