docs: Fix example of creating a transactional template in usage.md (#1314)

Author: robbieaverill

packages/client/USAGE.md

@@ -5362,12 +5362,12 @@ Transactional templates are templates explicitly created for transactional email
 
 ```javascript
   const data = {
-  "name": "example_name"
-};
+    "name": "example_name",
+    "generation": "dynamic"
+  };
   request.body = data;
   request.method = 'POST';
   request.url = '/v3/templates';
-  request.generation = 'dynamic'
   client.request(request)
   .then(([response, body]) => {
     console.log(response.statusCode);