Fixing image markdown

Author: Jim Bennett

articles/digital-twins/concepts-objectmodel-spatialgraph.md

@@ -80,7 +80,7 @@ https://YOUR_INSTANCE_NAME.YOUR_LOCATION.azuresmartspaces.net/management/swagger
 
  The full URL format appears in this image.
 
-(![Digital Twins portal Management API](media/concepts/digital-twins-spatial-graph-management-api-url.png)](media/concepts/digital-twins-spatial-graph-management-api-url.png#lightbox)
+[![Digital Twins portal Management API](media/concepts/digital-twins-spatial-graph-management-api-url.png)](media/concepts/digital-twins-spatial-graph-management-api-url.png#lightbox)
 
 For more details on how to use spatial intelligence graphs, visit the Azure Digital Twins Management APIs sneak preview.