docs(operators.md): fix broken "anatomy of a marble diagram" link (#6558)
docs(operators.md): fix broken "anatomy of a marble diagram" link (#6558)

Closes #6534
ReactiveX/rxjs,martinsik/rxjs,martinsik/rxjs,martinsik/rxjs,martinsik/rxjs,ReactiveX/rxjs,ReactiveX/rxjs,ReactiveX/rxjs