message: docs: update rxjs link to version 6
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diff: @@ -45,7 +45,7 @@ The `pipe()` function is also a method on the RxJS `Observable`, so you use this
  ### Common operators
  -RxJS provides many operators (over 150 of them), but only a handful are used frequently. Here is a list of common operators; for usage examples, see [RxJS 5 Operators By Example](https://github.com/btroncone/learn-rxjs/blob/master/operators/complete.md) in RxJS documentation.
  +RxJS provides many operators, but only a handful are used frequently. For a list of operators and usage samples, visit the [RxJS API Documentation](https://rxjs-dev.firebaseapp.com/api).
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  Note that, for Angular apps, we prefer combining operators with pipes, rather than chaining. Chaining is used in many RxJS examples.
  