Recently removed ServiceRegistry.injectServicesInto() is still recommended in docs

The docs [1] have this text:

Alternatively the object can be instantiated simply using new, then services injected using ServiceRegistry's {{injectServicesInto(…​)}} method.

This method is missing in 2.0.0-M3.  I found from Slack[2] that a replacement might be serviceInjector.injectServicesInto()

[1]: https://isis.apache.org/refguide/2.0.0-M3/applib-svc/about.html#using-the-services

[2]: https://the-asf.slack.com/archives/CFC42LWBV/p1579553230202600?thread_ts=1579553230.202600&cid=CFC42LWBV