Documentation for rawOutput

[dantel35]

Following the documentation for switching on raw output by adding
ENV['changeset-validations'].rawOutput = true;

to

config/environment.js

in a freshly created Octane project (with ember-changeset & ember-changeset-validations installed) leads to:
Cannot set property 'rawOutput' of undefined

It should mention that this option may be added like this:
let ENV = {
(...)
'changeset-validations': {rawOutput : true},
(...)
};