switch documentation job to new PTI

This is a mechanically generated patch to switch the documentation
jobs to use the new PTI versions of the jobs as part of the
python3-first goal.

See the python3-first goal document for details:
https://governance.openstack.org/tc/goals/stein/python3-first.html

Change-Id: I9e6048085bbd8b1451166f36565f95d556cb8d90
Story: #2002586
Task: #24341
(cherry picked from commit 09f1993a54)

zuul.d/layout.yaml

@@ -4,7 +4,7 @@
       - tripleo-multinode-baremetal-minimal
       - tripleo-multinode-container-minimal
       - check-requirements
-      - release-notes-jobs
+      - release-notes-jobs-python3
       - openstack-python35-jobs-no-constraints
     check:
       jobs:
@@ -89,7 +89,7 @@
             files:
               - ci/environments/scenario008-multinode-containers.yaml
               - ^(docker|puppet)/services/.*(odl|opendaylight).*$
-                - ^(docker|puppet)/services/neutron-plugin-ml2.yaml #LP1765975
+              - ^(docker|puppet)/services/neutron-plugin-ml2.yaml #LP1765975
               - ^environments\/.*.yaml
               - ^deployed-server/.*$
         - openstack-tox-pep8