ReactiveX / rxjs / 8250

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docs(operators): Add a simple example in doc string (#4636)

* docs(operators): describe your change...

Add much simpler example to help understand what `switchMap` can do. It is easy to understand for document reader.

* update the sample to following TS grammar

* updated according to suggestion

1. mark sample code in typescript
2. space between of(1, 2, 3)
3. outputs

* docs(operators): updated the sample code in docs

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