cleanup, docs

site/doc/pages/http_request_async.txt

@@ -5,3 +5,9 @@ u64 http_request_async(DValue req)
 ```
 
 Starts the same bounded curl-backed request as `http_request()` in the file-backed async job registry and returns a job id. Use `job_await()` or `job_result()` to retrieve the HTTP result.
+
+:see
+>socket
+
+:example
+print("http_request_async is resource-bound; configure the service or connection, then call it in request code.\n");