ref(js): Add baggage intormation to automatic instrumentation page (#5095)

Add instructions on how to deal with the new baggage header in CORS settings. The baggage header was introduced in v7 of the JS SDK.

Author: Lms24

src/platforms/javascript/common/performance/instrumentation/automatic-instrumentation.mdx

@@ -52,11 +52,11 @@ Supported options:
 
 ### tracingOrigins
 
-The default value of `tracingOrigins` is `['localhost', /^\//]`. The JavaScript SDK will attach the `sentry-trace` header to all outgoing XHR/fetch requests whose destination contains a string in the list or matches a regex in the list. If your frontend is making requests to a different domain, you will need to add it there to propagate the `sentry-trace` header to the backend services, which is required to link transactions together as part of a single trace. **The `tracingOrigins` option matches against the whole request URL, not just the domain. Using stricter regex to match certain parts of the URL ensures that requests do not unnecessarily have the `sentry-trace` header attached.**
+The default value of `tracingOrigins` is `['localhost', /^\//]`. The JavaScript SDK will attach the `sentry-trace` and `baggage` headers to all outgoing XHR/fetch requests whose destination contains a string in the list or matches a regex in the list. If your frontend is making requests to a different domain, you will need to add it there to propagate the `sentry-trace` and `baggage` headers to the backend services, which is required to link transactions together as part of a single trace. **The `tracingOrigins` option matches against the whole request URL, not just the domain. Using stricter regex to match certain parts of the URL ensures that requests do not unnecessarily have the additional headers attached.**
 
 <PlatformContent includePath="performance/tracingOrigins-example" />
 
-You will need to configure your web server [CORS](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Allow-Headers) to allow the `sentry-trace` header. The configuration might look like `"Access-Control-Allow-Headers: sentry-trace"`, but the configuration depends on your set up. If you do not allow the `sentry-trace` header, the request might be blocked.
+You will need to configure your web server [CORS](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Allow-Headers) to allow the `sentry-trace` and `baggage` headers. The configuration might look like `"Access-Control-Allow-Headers: sentry-trace"` and `"Access-Control-Allow-Headers: baggage"`, but it depends on your set up. If you do not allow the two headers, the request might be blocked.
 
 ### beforeNavigate