chore: fix syntax error in job function template (#3976)

Author: mkindahl

Diff for: use-timescale/jobs/create-and-manage-jobs.md

@@ -29,12 +29,13 @@ To create a $JOB, create a [function][postgres-createfunction] or [procedure][po
     ```sql
     CREATE FUNCTION <function_name> (required arguments)
     RETURNS <return_datatype> AS $<variable_name>$
-        DECLARE
-            <declaration>;
-        BEGIN
-            <function_body>;
-            RETURN { <variable_name> | value }
-        END; LANGUAGE <language>;
+	DECLARE
+		<declaration>;
+	BEGIN
+		<function_body>;
+		RETURN { <variable_name> | value }
+	END;
+	$<variable_name>$ LANGUAGE <language>;
     ```
 
     For example, to create a function that returns the total row count of a table within a $SERVICE_SHORT:
@@ -173,4 +174,4 @@ Alter an existing $JOB with [`alter_job`][api-alter_job]. You can change both th
 [api-timescaledb_information-jobs]: /api/:currentVersion:/informational-views/jobs/
 [postgres-createfunction]: https://www.postgresql.org/docs/current/xfunc.html
 [postgres-createprocedure]: https://www.postgresql.org/docs/current/xproc.html
-[plpgsql]: https://www.postgresql.org/docs/current/plpgsql-overview.html
+[plpgsql]: https://www.postgresql.org/docs/current/plpgsql-overview.html