add comment for javascript browser

Author: priscilawebdev

platform-includes/llm-rules-platform/_default.mdx

@@ -2,6 +2,10 @@
 
 Sentry provides a set of rules you can use to help your LLM use Sentry correctly. Copy this file and add it to your projects rules configuration. When created as a rules file this should be placed alongside other editor specific rule files. For example, if you are using Cursor, place this file in the `.cursorrules` directory.
 
+{/* ATTENTION: The rules defined here must match those in the app's onboarding documentation (see: https://github.com/getsentry/sentry/blob/master/static/app/gettingStartedDocs/javascript/javascript.tsx).
+If you make any changes, please update the getting started doc accordingly. */}
+
+
 ````markdown {filename:rules.md}
 These examples should be used as guidance when configuring Sentry functionality within a project.