CRA@3: Eject warning message references CRA2

Created by: petetnt

The warning message links to the CRA2 release blog post, but we probably want to link some page in the docs (eg. extended https://facebook.github.io/create-react-app/docs/alternatives-to-ejecting) where these things are explained briefly.

https://github.com/facebook/create-react-app/blob/dc133a351f16c2e2e7991416a9ebdaab3c2b6ec1/packages/react-scripts/scripts/eject.js#L57-L63

Steps to Reproduce

1.Create a new CRA3 app with npx create-react-app@3.0.0-next.68 foobar 2. cd foobar 3. yarn eject

Expected Behavior

Eject message references to CRA3

Actual Behavior

We see the following warning:

NOTE: Create React App 2 supports TypeScript, Sass, CSS Modules and more without ejecting: https://reactjs.org/blog/2018/10/01/create-react-app-v2.html

Reproducible Demo