plunkers for api docs

[Foxandxss]

There is a task we had in the past. Let's create an issue so we don't forget on implementing it in the future.

Related issues/PRs:

angular/angular.io#2425
#11775

[petebacondarwin]

@Foxandxss Does this work now? Is it just a case of updating the content?

[Foxandxss]

This was created super long ago, so it probably need a tweak or two

[IgorMinar]

#11775 is closed now so I'm closing this issue. If this is not resolved please open a new issue and specify what exactly needs to be done.

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