Fix dev-guide in confpy

otc_metadata/templates/conf.py.j2

@@ -128,7 +128,11 @@ html_copy_source = False
 latex_documents = [
 {%- if doc_type %}
     ('index',
+    {%- if doc_type == 'dev' %}
+     '{{ service_type }}-dev-guide.tex',
+    {%- else %}
      '{{ service_type }}-{{ doc_type }}.tex',
+    {% endif -%}
      u'{{ title }}',
      u'OpenTelekomCloud', 'manual'),
 {% endif -%}