fix spacing for dynamic handoff (#658)

Author: arthurchi93

fern/tools/handoff.mdx

@@ -213,8 +213,8 @@ destination: {
         "type": "object",
         "properties": {
             "name": {
-            "type": "string",
-            "description": "Name of the customer",
+              "type": "string",
+              "description": "Name of the customer",
             },
         },
         "required": ["name"],