CHANGES.md: Improve X-Frame-Options note
CHANGES.md: Improve X-Frame-Options note

kensipe/dcos,kensipe/dcos,kensipe/dcos,GoelDeepak/dcos,dcos/dcos,GoelDeepak/dcos,dcos/dcos,dcos/dcos,GoelDeepak/dcos,dcos/dcos,dcos/dcos,GoelDeepak/dcos,kensipe/dcos