Verify docs match examples updates for rxjs@6.0.0-alpha.4

[jenniferfell]

I'm submitting a...

[ ] Regression (a behavior that used to work and stopped working in a new release)
[ ] Bug report  
[ ] Feature request
[ X ] Documentation issue or request
[ ] Support request => Please do not submit support request here, instead see https://github.com/angular/angular/blob/master/CONTRIBUTING.md#question

Current behavior

Doc text matches old examples

Expected behavior

Ensure doc text matches updated examples in PR #22573

Minimal reproduction of the problem with instructions

What is the motivation / use case for changing the behavior?

Ensure doc text matches what is shown in the codesnippets pulled from the examples

Environment

Angular version: X.Y.Z


Browser:
- [ ] Chrome (desktop) version XX
- [ ] Chrome (Android) version XX
- [ ] Chrome (iOS) version XX
- [ ] Firefox version XX
- [ ] Safari (desktop) version XX
- [ ] Safari (iOS) version XX
- [ ] IE version XX
- [ ] Edge version XX
 
For Tooling issues:
- Node version: XX  
- Platform:  

Others:

[jenniferfell]

@jbogarthyde Opening an issue so we can easily link this doc update request (and doc update PR) to the original examples update PR.

[IgorMinar]

I believe that this is done and can be closed. if not please reopen.

[angular-automatic-lock-bot]

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