Fix disk usage value in preinstall notes (#455)

frameworks/kafka/universe/package.json

@@ -19,7 +19,7 @@
     "pubsub",
     "kafka"
   ],
-  "preInstallNotes": "Default configuration requires 3 agent nodes each with: 1.0 CPU, 2048 MB MEM and 1,5000 MB Disk.\n\nNote that Kafka requires a Zookeeper instance to be available before starting. It is a good practice to deploy a dedicated Zookeeper service, but you can always fall-back into using the DC/OS core Zookeeper instance instead.",
+  "preInstallNotes": "Default configuration requires 3 agent nodes each with: 1.0 CPU, 2048 MB MEM and a 5000 MB Disk.\n\nNote that Kafka requires a Zookeeper instance to be available before starting. It is a good practice to deploy a dedicated Zookeeper service, but you can always fall-back into using the DC/OS core Zookeeper instance instead.",
   "postInstallNotes": "The DC/OS Apache Kafka service is being installed.\n\n\tDocumentation: {{documentation-path}}\n\tIssues: {{issues-path}}",
   "postUninstallNotes": "The DC/OS Apache Kafka service is being uninstalled.\n\nFor DC/OS versions from 1.11 no further action is required. For older DC/OS versions follow the instructions at {{documentation-path}}uninstall to remove any persistent state if required.",
   "scm": "https://github.com/mesosphere/dcos-kafka-service",