docs: fix waitpoint token completion request body field

Fixed documentation examples to use correct 'data' field instead of
'output' for the waitpoint token completion endpoint.

The API schema expects 'data' in the request body, but all code examples
(curl, Python, Ruby, Go) incorrectly showed 'output', causing waitpoints
to complete with empty/undefined output when users followed the docs.

Fixes #2872

Author: appdevelopers9a

docs/wait-for-token.mdx

@@ -177,7 +177,7 @@ You can complete a token using a raw HTTP request or from another language.
 curl -X POST "https://api.trigger.dev/api/v1/waitpoints/tokens/{tokenId}/complete" \
   -H "Authorization: Bearer {token}" \
   -H "Content-Type: application/json" \
-  -d '{"output": { "status": "approved"}}'
+  -d '{"data": { "status": "approved"}}'
 ```
 
 ```python python
@@ -186,7 +186,7 @@ import requests
 response = requests.post(
   "https://api.trigger.dev/api/v1/waitpoints/tokens/{tokenId}/complete",
   headers={"Authorization": f"Bearer {token}"},
-  json={"output": { "status": "approved"}}
+  json={"data": { "status": "approved"}}
 )
 ```
 
@@ -199,7 +199,7 @@ http = Net::HTTP.new(uri.host, uri.port)
 request = Net::HTTP::Post.new(uri)
 request["Authorization"] = "Bearer {token}"
 request["Content-Type"] = "application/json"
-request.body = JSON.generate({ output: { status: "approved" } })
+request.body = JSON.generate({ data: { status: "approved" } })
 
 response = http.request(request)
 ```
@@ -218,7 +218,7 @@ func main() {
 	url := "https://api.trigger.dev/api/v1/waitpoints/tokens/{tokenId}/complete"
 
 	payload := map[string]interface{}{
-		"output": map[string]interface{}{
+		"data": map[string]interface{}{
 			"status": "approved",
 		},
 	}