Xstate: respond not a root export as per documentation

[njdancer]

Description
https://github.com/davidkpiano/xstate/blob/master/docs/guides/communication.md suggests that respond should be a root export however looking at the current source this does not appear to be the case. It is currently exported as a value on the actions export.

Expected Result
import { respond } from "xstate" should work.

Actual Result
Currently the following works:

import { actions } from "xstate"
const { respond } = actions

Additional context
Happy to submit a PR but not sure whether the code or documentation is incorrect. Personally I'd prefer respond to be a default export. While I'm at it would love log to be a default export as well. Understand you may wish to avoid polluting the export namespace however.

[Andarist]

Seems like we might want to export more than only respond - there are a bunch of actions that are currently not exported directly.

@davidkpiano is there any rule of thumb here? should we just export all of them? or hide (under actions export) all of them in the future?

[davidkpiano]

We should export all of them, which I'll be doing before the release.

This also isn't public documentation, so I'll close this for now - the documentation on master has not been published yet 😅