Clarify AsyncIterable docs

[joebowbeer]

Two questions about "extracting as an async iterator"

https://github.com/mafintosh/tar-stream?tab=readme-ov-file#extracting-as-an-async-iterator

The extraction stream in addition to being a writable stream is also an async iterator

1. Is it an AsyncIterable or an AsyncIterator?

2. How are the bodies of the entries consumed?

Is the following correct? (I think this works for me.)

for await (const entry of extract) {
  if (entry.header.type === "file") {
    for await (const chunk of entry) {
      process(chunk);
    }
  } else {
    entry.resume();
  }
}