message: docs/local-dev: add note about jest config selecting the env
diff: @@ -521,7 +521,9 @@ The built-in configuration brings a couple of benefits and features. The most
  important one being a baseline transformer and module configuration that enables
  support for the listed [loaders](#loaders) within tests. It will also
  automatically detect and use `src/setupTests.ts` if it exists, and provides a
  -coverage configuration that works well with our selected transpilers.
  +coverage configuration that works well with our selected transpilers. The configuration
  +will also detect the appropriate Jest environment for each package role, running
  +`web-libraries` with the `"jsdom"` environment, `node-libraries` with `"node"`, and so on.
  The configuration also takes a project-wide approach, with the expectation most
  if not all packages within a monorepo will use the same base configuration. This
  