BD-3263 Add the icon for generating a nested event property schema.

_docs/_user_guide/data_and_analytics/custom_data/custom_events/nested_objects.md

@@ -31,7 +31,7 @@ To access the nested data in your custom event, generate a schema for each event
 
 1. Go to **Data Settings** > **Custom Events**.
 2. Select **Manage Properties** for the events with nested properties.
-3. Click the icon to generate the schema. To view the schema, click the <i class="fas fa-plus"></i> plus button.
+3. Click the <i class="fas fa-arrows-rotate"></i> button to generate the schema. To view the schema, click the <i class="fas fa-plus"></i> button.
 
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