message: Clarify that the behavior of the iterator (advancing whenever any of the components is evaluated) is not magic, but a simple consequence of the dataflow graph structure.
diff: @@ -322,9 +322,10 @@ sess.run(iterator.initializer)
  next1, (next2, next3) = iterator.get_next()
  ```
  -Note that evaluating *any* of `next1`, `next2`, or `next3` will advance the
  -iterator for all components. A typical consumer of an iterator will include all
  -components in a single expression.
  +Note that `next1`, `next2`, and `next3` are tensors produced by the
  +same op/node (created by `Iterator.get_next()`). Therefore, evaluating *any* of
  +these tensors will advance the iterator for all components. A typical consumer
  +of an iterator will include all components in a single expression.
  ## Reading input data
  