Obsolete REST security documentation (7.0.1)

Quoting from 7.1 version of this issue (JDG-851).

"With re-enabling REST endpoint security its configuration changes little bit and documentation needs to be updated. Authentication is now in separate sub-element:

<rest-connector socket-binding="rest" cache-container="security">

<authentication security-realm="ApplicationRealm" auth-method="BASIC"/>

</rest-connector>"