Remove the old clients compatibility chart. (#4163)
Remove the old clients compatibility chart. (#4163)

Any of these clients in question would be using versions older than a
year and should upgrade.
vam-google/google-cloud-java,vam-google/google-cloud-java,vam-google/google-cloud-java,vam-google/google-cloud-java,vam-google/google-cloud-java,vam-google/google-cloud-java