java-stream-append-prepend article needs minor correction

[GeoffChurch]

    Hi @lor6, I think the article still needs a minor update.

It says

In this case, since the stream is not consumed greedily, it is still partially lazy

The new approach is actually fully lazy, so you can e.g. insert an element at index 3 billion in constant time.

Also, the conclusion says

Keep in mind that although prepending an element works for any Stream, adding it to the end or at a specific index only works for finite streams.

This sentence can probably be removed because inserting at a specific finite index now works for any Stream, and it does technically work to append to the end of an infinite stream, you just wouldn't reach the element after a finite number of steps.

Originally posted by @GeoffChurch in #10931 (comment)

[ulisseslima]

Hey @GeoffChurch.

We'll look into it.

[dkapil]

The article is updated with @GeoffChurch suggestions.