Fix cassandra notes (#937)
Fix cassandra notes (#937)

* Revert "Add plan-summary endpoint (#911)"

This reverts commit 9668f128eb70eb73a76be62cc6b50c22fc1a83a4.

* Fix beta-cassandra pre-release notes

vishnu2kmohan/dcos-commons,mesosphere/dcos-commons,vishnu2kmohan/dcos-commons,mesosphere/dcos-commons,mesosphere/dcos-commons,mesosphere/dcos-commons,vishnu2kmohan/dcos-commons,vishnu2kmohan/dcos-commons,vishnu2kmohan/dcos-commons,mesosphere/dcos-commons