Update Bun and Node.js docs with warning about early Sentry initialization

Co-authored-by: paul.jaffre <[email protected]>

Author: cursoragent

docs/platforms/javascript/guides/bun/index.mdx

@@ -64,7 +64,11 @@ You can also manually capture performance data - see <PlatformLink to="/tracing/
 
 ## Use
 
-You need to import the `instrument.js` file before importing any other modules in your application. This is necessary to ensure that Sentry can automatically instrument all modules in your application:
+<Alert level='warning'>
+
+Import `instrument.js` before any other modules to ensure Sentry initializes early. If you initialize later, auto-instrumentation and modules like database monitoring, agent monitoring, tracing may not work.
+
+</Alert>
 
 ```javascript {filename: app.js}
 // Import this first!

platform-includes/getting-started-node/javascript.mdx

@@ -26,7 +26,11 @@ To import and initialize Sentry, create a file named `instrument.(js|mjs)` in th
 
 ### Apply Instrumentation to Your App
 
-Make sure to initialize Sentry before you require or import any other modules in your app. Otherwise, auto-instrumentation won't work for these modules.
+<Alert level='warning'>
+
+Import `instrument.js` before any other modules to ensure Sentry initializes early. If you initialize later, auto-instrumentation and modules like database monitoring, agent monitoring, tracing may not work.
+
+</Alert>
 
 <Alert level="info" title="Which module system are you using?">