code: public final FluentCloseableIterable<T> append(Iterable<? extends T> other) {
          return from(wrap(Iterables.concat(this, other), this));
      }
docs: Returns a fluent iterable whose iterators traverse first the elements of this fluent iterable,
  followed by those of {@code other}. The iterators are not polled until necessary.
  
  <p>The returned iterable's {@code Iterator} supports {@code remove()} when the corresponding
  {@code Iterator} supports it.