add additional informations what will be sent to sentry in the dart h…

…ttp integration

docs/platforms/dart/integrations/http-integration.mdx

@@ -21,6 +21,8 @@ var uriResponse = await client.post('https://example.com/whatsit/create',
 }
 ```
 
+The error event sent to sentry contains the "request method", "request url", "request header", "request body", "request content-length", "request duration", "response headers", "response content-length" and the "response status code".
+
 This is an opt-out feature. The following example shows how to disable it:
 
 <SignInNote />