Now that we have a single hacking check factory in lib [1], we've followed-up by enhancing the neutron-lib periodic job to include pep8 checks (see depends on patch). This patch makes a few doc clarifications as to the pep8 inclusion in the job. [1] I0a8b39052c0f81f2ecbab3923353be1537b89a65 Change-Id: I035ffa8d34b0ebdabf730e99200739365f041343 Depends-On: I9bb173071abcbc5078a3fd728c41c34bf1b83ca2