Fix issue with latex_documents

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>

otc_metadata/templates/conf.py.j2

@@ -126,9 +126,9 @@ html_copy_source = False
 
 # -- Options for PDF output --------------------------------------------------
 latex_documents = [
-{%- if pdf_name is defined %}
+{%- if doc_type %}
     ('index',
-     '{{ pdf_name }}.tex',
+     '{{ service_type }}-{{ doc_type }}.tex',
      u'{{ title }}',
      u'OpenTelekomCloud', 'manual'),
 {% endif -%}