Update workshop_continuous_diffusion_yfv.md added spread4 callout

tutorials/workshop_continuous_diffusion_yfv/workshop_continuous_diffusion_yfv.md

@@ -25,7 +25,8 @@ To undertake this tutorial, you will need to download three software packages in
 
 {% include figtree_callout.md %}
 
-{% include spread3_callout.md %} <!--NT: couldn't find the callout for spread4-->
+<!-- {% include spread3_callout.md %} -->
+{% include spread4_callout.md %}
 
 <div class="alert alert-success" role="alert"><i class="fa fa-download fa-lg"></i> All the files needed for this tutorial
 <a href="{{ root_url }}files/continuousTutorialFiles.zip"> can be downloaded from here</a>.