fix issue in conf.py template

otc_metadata/templates/conf.py.j2

@@ -145,11 +145,11 @@ latex_elements = {
   'papersize': 'a4paper',
   'pointsize': '12pt',
   'figure_align': 'H',
-  'preamble': rf'''
+  'preamble': rf'''{% raw %}
         \newcommand{{\githash}}{{{current_commit_hash}}}
         \newcommand{{\gitcommittime}}{{{current_commit_time}}}
         \newcommand{{\doctitle}}{{{otcdocs_doc_title}}}
-        \newcommand{{\servicetitle}}{{{otcdocs_service_title}}}
+        \newcommand{{\servicetitle}}{{{otcdocs_service_title}}}{% endraw %}
   ''',
   'sphinxsetup': 'hmargin={15mm,15mm}, vmargin={20mm,30mm}, marginpar=10mm'
 }