langref: improve for loop documentation

- Add an example of iterating over consecutive integers using the
    range syntax
  - Add an example of iterating over multiple objects
  - Update the "nested break" and "nested continue" tests to use the
    range syntax, instead of a temporary array
658b4db223Manlio Perillo committed on 4/23/2023, 6:00:10 PM· committed by GitHubparent253eb72
1 file changedLine totals unavailable