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: Ide7c4b796c480666bf514e5a31476a7a087b39d3
Story: #2002586
Task: #24294

.zuul.yaml

@@ -2,7 +2,7 @@
     templates:
       - openstack-python-jobs-neutron
       - check-requirements
-      - publish-openstack-sphinx-docs
+      - publish-openstack-docs-pti
       - openstack-python35-jobs-neutron
     check:
       jobs:
@@ -20,7 +20,7 @@
         - kuryr-kubernetes-tempest-dragonflow:
             voting: false
         - openstack-tox-lower-constraints
-        - build-openstack-sphinx-docs:
+        - openstack-tox-docs:
             required-projects:
               - openstack/networking-sfc
               - openstack/neutron-dynamic-routing
@@ -41,7 +41,7 @@
         - dragonflow-dsvm-fullstack-redis
         - openstack-tox-lower-constraints
 
-        - build-openstack-sphinx-docs:
+        - openstack-tox-docs:
             required-projects:
               - openstack/networking-sfc
               - openstack/neutron-dynamic-routing