updating again, including umbra imagery

Author: pcoma55

articles/planetary-computer/data-visualization-samples.md

@@ -12,6 +12,7 @@ ms.custom:
 
 # Microsoft Planetary Computer Pro Data Visualization Gallery
 
+
 ## Sentinel-2-l2a Collection Configuration
 
 [Collection description to be added here]
@@ -685,6 +686,7 @@ The STAC Collection configuration defines the core metadata for this collection.
 }
 ```
 
+---
 
 ## Umbra SAR Imagery Collection Configuration
 
@@ -866,4 +868,6 @@ The STAC Collection configuration defines the core metadata for this collection.
   ],
   "msft:short_description": "Umbra Synthetic Aperture Radar (SAR) Imagery"
 }
-```
+```
+
+---