chore: fix description content of fact table

Author: CyprienKelma

dbt/models/mart/core/fct__viewings/fct__viewings.yml

@@ -5,13 +5,17 @@ models:
   # fct_viewings : Fact table for viewing events in star schema
   # =============================================================================
   - name: fct_viewings
-    description: |
-      Fact table representing viewing events on the BigMedia VoD platform.
-      
-      Each row represents a unique viewing session with metrics and foreign keys
-      to all dimension tables. This is the central table of the star schema.
-      
-      Grain: One row per viewing session per user per content.
+    description: |-
+        Fact table representing viewing events on the BigMedia VoD platform.
+
+        Each row represents a unique viewing session with metrics and foreign keys
+        to all dimension tables. This is the central table of the star schema.
+
+        Grain: One row per viewing session per user per content.
+
+        ## Data Model Diagram
+
+        [View interactive diagram](dbt/assets/img/mart/core/fct__viewings/fct__viewings_model.html)
       
     columns:
       - name: viewing_sk