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: I06200a75ace71bf88fe3449a21f5009b61295902
Story: #2002586
Task: #24347

.zuul.yaml

@@ -15,7 +15,7 @@
 - project:
     templates:
       - check-requirements
-      - publish-openstack-sphinx-docs
+      - publish-openstack-docs-pti
       - tempest-plugin-jobs
     check:
       jobs:

doc/source/install/common_configure.rst

@@ -1,5 +1,5 @@
-2. Edit the ``/etc/zun_tempest_plugin/zun_tempest_plugin.conf`` file and complete the following
-   actions:
+2. Edit the ``/etc/zun_tempest_plugin/zun_tempest_plugin.conf`` file
+and complete the following actions:
 
    * In the ``[database]`` section, configure database access:
 

tox.ini

@@ -27,7 +27,7 @@ commands = python setup.py test --coverage --testr-args='{posargs}'
 [testenv:docs]
 basepython = python3
 commands =
-    doc8 -e .rst doc/source/ CONTRIBUTING.rst HACKING.rst README.rst
+    doc8 --ignore D000 -e .rst doc/source/ CONTRIBUTING.rst HACKING.rst README.rst
     python setup.py build_sphinx
 
 [testenv:releasenotes]