add comment to auth token

Author: inventarSarah

docs/platforms/javascript/guides/sveltekit/manual-setup.mdx

@@ -147,9 +147,9 @@ export default defineConfig({
 
 ## Step 3: Add Readable Stack Traces With Source Maps (Optional)
 
-To upload source maps for clear error stack traces, create an environment variable for your auth token and add your Sentry organization, and project slug in your `vite.config.(js|ts)` file:
+To upload source maps for clear error stack traces, add your Sentry auth token, organization, and project slug in your `vite.config.(js|ts)` file:
 
-```javascript {filename:vite.config.(js|ts)} {6-10}
+```javascript {filename:vite.config.(js|ts)} {6-11}
 import { sveltekit } from "@sveltejs/kit/vite";
 import { sentrySvelteKit } from "@sentry/sveltekit";
 
@@ -159,6 +159,7 @@ export default {
       sourceMapsUploadOptions: {
         org: "___ORG_SLUG___",
         project: "___PROJECT_SLUG___",
+        // store your auth token in an environment variable
         authToken: process.env.SENTRY_AUTH_TOKEN,
       },
     }),