When an author submits a new document to the LDP, someone monitoring the submission email list will advise the author to post his draft to the discussion list for an initial peer review, prior to publication. Besides determining whether the document thoroughly covers the subject matter, peers may also point out similar work already in the document collection, in which case the new author might want to contact the maintainer of the existing work.
As a member of the review team, you will recognize a peer review document as one the author has submitted to the discussion list, specifically requesting feedback for inclusion of their HOWTO in the collection. This review can be performed by anyone subscribed to the discussion list (www.tldp.org/mailinfo.html#maillists).