shelf_io: fix doc comment link to HttpResponse.bufferOutput
diff --git a/lib/shelf_io.dart b/lib/shelf_io.dart
index 7f28a17..73c514b 100644
--- a/lib/shelf_io.dart
+++ b/lib/shelf_io.dart
@@ -11,14 +11,13 @@
/// supports the `"shelf.io.buffer_output"` `Response.context` property. If this
/// property is `true` (the default), streamed responses will be buffered to
/// improve performance; if it's `false`, all chunks will be pushed over the
-/// wire as they're received. See [`HttpResponse.bufferOutput`][bufferOutput]
+/// wire as they're received. See
+/// [`HttpResponse.bufferOutput`](https://api.dartlang.org/stable/dart-io/HttpResponse/bufferOutput.html)
/// for more information.
///
/// `Request`s passed to a `Handler` will contain the
/// `"shelf.io.connection_info"` `Request.context` property, which holds the
/// `HttpConnectionInfo` object from the underlying `HttpRequest`.
-///
-/// [bufferOutput]: https://api.dartlang.org/apidocs/channels/stable/dartdoc-viewer/dart:io.HttpResponse#id_bufferOutput
import 'dart:async';
import 'dart:io';
