Update json-endpoint.mdx

fix typescript example

Author: kathayl

src/content/docs/browser-rendering/rest-api/json-endpoint.mdx

@@ -233,14 +233,40 @@ Below is an example using the TypeScript SDK:
 import Cloudflare from "cloudflare";
 
 const client = new Cloudflare({
-	apiEmail: process.env["CLOUDFLARE_EMAIL"], // This is the default and can be omitted
-	apiKey: process.env["CLOUDFLARE_API_KEY"], // This is the default and can be omitted
+  apiToken: process.env["CLOUDFLARE_API_TOKEN"], // This is the default and can be omitted
 });
 
 const json = await client.browserRendering.json.create({
-	account_id: "account_id",
-});
-
+  account_id: process.env["CLOUDFLARE_ACCOUNT_ID"],
+  url: "https://developers.cloudflare.com/",
+  prompt: "Get me the list of AI products",
+  response_format: {
+    type: "json_schema",
+    schema: {
+        type: "object",
+        properties: {
+          products: {
+            type: "array",
+            items: {
+              type: "object",
+              properties: {
+                name: {
+                  type: "string"
+                },
+                link: {
+                  type: "string"
+                }
+              },
+              required: [
+                "name"
+              ]
+            }
+          }
+        }
+      }
+    }
+  }
+);
 console.log(json);
 ```