The Series is Underway
The document will be published in multiple installments, beginning with Sections 1 and 2 which are available now. Since LWN is a business the reasonable limitation is put in place that for the first week only subscribers have access to it.
So, get a subscription to LWN.
If you find mistakes in the text let me know directly, either as a comment here or as a personal mail. Don't bother J on with that.