Report.rst: udpate doc

Documentation/Report.rst

@@ -1635,7 +1635,7 @@ Example::
     # Create a dedicated tt-content record (on any T3 page, might be on the same page as the JS code).
     # The example above assumes that this record has the tt_content.uid=12345.
     render = api
-    10.sql = SELECT '{{arg1:S}} {{arg2:S}} ', NOW()
+    10.sql = SELECT '{{arg1:S}} {{arg2:S}} {{arg3:C}}', NOW()
 
 
 .. _special-sql-functions: