message: docs: square odds example in rxjs guide
  Added argument type to filter function of rxjs. Fixed the
  return value of filtering of odd numbers
  PR Close
diff: @@ -8,7 +8,7 @@ const nums = of(1, 2, 3, 4, 5);
  // Create a function that accepts an Observable.
  const squareOddVals = pipe(
  - filter(n => n % 2),
  + filter((n: number) => n % 2 !== 0),
  map(n => n * n)
  );
  