add 'hidden' explanation

Author: s1gr1d

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

@@ -173,6 +173,11 @@ export default defineNuxtConfig({
 
 The option `'hidden'` works like `true`, but suppresses the source map reference comments that would be added to the end of each generated file in the build output.
 
+When opening browser developer tools, browsers attempt to fetch source maps through reference comments at the end of bundled files.
+After those source maps are uploaded to Sentry during the build process and the SDK removes these client-side source maps, any reference to source maps would trigger 404 errors in the developer tools.
+The `'hidden'` option prevents these reference comments from being generated, stopping browsers from attempting to fetch non-existent map files.
+This approach eliminates unnecessary network errors in browser developer tools.
+
 Explicitly enabling client source maps is necessary because Nuxt sets default values for source maps ([Nuxt docs](https://nuxt.com/docs/api/nuxt-config#sourcemap)), and the Sentry Nuxt Module keeps these settings when they are explicitly defined.
 
 ## Verify