Update java version doc (#2202)
Update java version doc (#2202)


shinfan/gcloud-java,shinfan/gcloud-java,mbrukman/gcloud-java,mbrukman/gcloud-java,vam-google/google-cloud-java,shinfan/gcloud-java,shinfan/gcloud-java,vam-google/google-cloud-java,vam-google/google-cloud-java,FirebasePrivate/google-cloud-java,vam-google/google-cloud-java,vam-google/google-cloud-java,FirebasePrivate/google-cloud-java,vam-google/google-cloud-java,mbrukman/gcloud-java,FirebasePrivate/google-cloud-java,mbrukman/gcloud-java,FirebasePrivate/google-cloud-java,FirebasePrivate/google-cloud-java,shinfan/gcloud-java