Fix documentation (#2409)

Summary:
Follow-up of https://github.com/pytorch/audio/issues/2407, the <script> was not properly closed on pages other than tutorials

Pull Request resolved: https://github.com/pytorch/audio/pull/2409

Reviewed By: carolineechen

Differential Revision: D36632668

Pulled By: mthrok

fbshipit-source-id: 9c0409a8011d77f8689e2dcdc1bd9844d3d31f79

docs/source/_templates/layout.html

@@ -107,6 +107,6 @@
                }
            };
        });
-    </script>
       {% endif %}
+    </script>
 {% endblock %}