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: I05cb4e43651e02f79a220f041619240fb5f69a07
Story: #2002586
Task: #24316
diff --git a/zuul.d/projects.yaml b/zuul.d/projects.yaml
index bbc7a07..8286212 100644
--- a/zuul.d/projects.yaml
+++ b/zuul.d/projects.yaml
@@ -3,7 +3,7 @@
 - project:
     templates:
       - check-requirements
-      - publish-openstack-sphinx-docs
+      - publish-openstack-docs-pti
       - tempest-plugin-jobs
     check:
       jobs: