Update docs job

publish-openstack-sphinx-docs jobs are obsolete since some time,
use the newer publish-openstack-docs-pti jobs instead.

Comment out tox for specs since no specs exist so far and the building
fails otherwise.

Change-Id: Iee6be1fbdc3ea764b482e7a017ddca0b4060847b

.zuul.yaml

@@ -1,3 +1,3 @@
 - project:
     templates:
-      - publish-openstack-sphinx-docs
+      - publish-openstack-docs-pti

doc/source/specs.rst

@@ -4,8 +4,10 @@ Design specifications
 When adding a new spec, please use ``specs/template.rst`` as a
 starting point.
 
-.. toctree::
-   :glob:
-   :maxdepth: 1
+.. commented out until there is content
 
-   specs/*
+   .. toctree::
+      :glob:
+      :maxdepth: 1
+
+      specs/*