message: docs(aio): fix TS warning error  - filter expects a boolean function param
  PR Close
diff: @@ -6,7 +6,7 @@ import { filter, map } from 'rxjs/operators';
  const squareOdd = of(1, 2, 3, 4, 5)
  .pipe(
  - filter(n => n % 2),
  + filter(n => n % 2 !== 0),
  map(n => n * n)
  );
  