DOC: Fixed spurious comma in JSON.

src/doc/extension/query_templates.rst

@@ -192,7 +192,7 @@ The following example for the file global_query_shortcuts.json would create two
         {
             "description": "Show a table of Experiments for year: {year}",
             "query": "SELECT date, project, identifier FROM Record Experiment with date in {year}"
-        },
+        }
     ]
 
 Data Model for User Query Templates