Restore reference to custom backoffice view

This was previously present in the v15 docs and should be included here

Author: AdamBurtEtch

16/umbraco-cms/fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/rich-text-editor/blocks.md

@@ -181,6 +181,10 @@ When using Models Builder, specify the Content and Settings models for type-safe
 </blockquote>
 ```
 
+## Build a Custom Backoffice View
+
+Building Custom Views for Block representations in Backoffice is the same for all Block Editors. [Read about building a Custom View for Blocks here](../../../../../tutorials/creating-custom-views-for-blocklist.md).
+
 ## Best Practices
 
 ### Content Design