Update screenshot-endpoint.mdx

fix /screenshot typescript example

Author: kathayl

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

@@ -36,12 +36,15 @@ curl -X POST 'https://api.cloudflare.com/client/v4/accounts/<accountId>/browser-
 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"],
 });
 
 const screenshot = await client.browserRendering.screenshot.create({
-	account_id: "account_id",
+	account_id: process.env["CLOUDFLARE_ACCOUNT_ID"],
+	html: "Hello World!",
+    screenshotOptions: {
+        omitBackground: true,
+    }
 });
 
 console.log(screenshot.status);