Update tox.ini && conf.py file

Reviewed-by: tischrei <tino.schreiber@t-systems.com>
Co-authored-by: Sebastian Gode <sebastian.gode@telekom.de>
Co-committed-by: Sebastian Gode <sebastian.gode@telekom.de>

tox.ini

@@ -44,7 +44,7 @@ commands =
   {[testenv:umn]commands}
   {[testenv:json-umn]commands}
 
-[testenv:docs-pdf]
+[testenv:pdf-docs]
 deps =
   {[testenv:docs]deps}
   {[testenv:bindeps]deps}

zuul.yaml

@@ -4,6 +4,10 @@
     default-branch: main
     templates:
       - helpcenter-base-jobs
+    vars:
+      sphinx_pdf_files:
+        - rfs-api-ref.pdf
+        - rfs-umn.pdf
     check:
       jobs:
         - noop