Update 04-ordering-commenting.md

Author: jyssy

_episodes/04-ordering-commenting.md

@@ -87,3 +87,4 @@ ON publishers.id = journals.PublisherId;
 ~~~
 {: .sql}
 To see the introduction and explanation of JOINS, please click to [Episode 6](https://librarycarpentry.org/lc-sql/06-joins-aliases/index.html).
+{: .sql}