docs(module-commentaires.md): fix formatting of code block and improve section headers for better readability

Author: somayaassaadi

i18n/en/docusaurus-plugin-content-docs/current/installation/module-commentaires.md

@@ -34,9 +34,10 @@ Standard code to copy, paste, and complete:
         (d.head || d.body).appendChild(s);
     })();
 </script>
+```
 
-#### Configuration variables
 
+#### Configuration variables
 
 - **shortname**  
   Name of the Logora application associated with your site.