Update Container-VM Image product name in docs

cluster/gce/gci/README.md

-# Google Container-VM Image (GCI)
+# Container-VM Image
 
-[GCI](https://cloud.google.com/compute/docs/containers/vm-image/) is a container-optimized OS image for the Google Cloud Platform (GCP). We built GCI primarily for running Google services on GCP. Unlike the open preview version of container-vm, Google Container-VM Image is based on the open source Chromium OS project, allowing us greater control over the build management, security compliance, and customizations for GCP.
+[Container-VM Image](https://cloud.google.com/compute/docs/containers/vm-image/)
+is a container-optimized OS image for the Google Cloud Platform (GCP). It is
+primarily for running Google services on GCP. Unlike the open preview version
+of container-vm, the new Container-VM Image is based on the open source
+ChromiumOS project, allowing us greater control over the build management,
+security compliance, and customizations for GCP.
 
 
 [![Analytics](https://kubernetes-site.appspot.com/UA-36037335-10/GitHub/cluster/gce/gci/README.md?pixel)]()