Remove boilerplate

Author: keithduncan

SECURITY.md

@@ -14,7 +14,3 @@ version of the Elastic CI Stack for AWS.
 
 If you have found a vulnerability, please see https://buildkite.com/security
 for details on where and how to report it.
-
-Tell them where to go, how often they can expect to get an update on a
-reported vulnerability, what to expect if the vulnerability is accepted or
-declined, etc.