etcd-2-1-0-bench: Fix an absolute bare link to resource outside of Documentation dir
@@ -49,4 +49,4 @@ Bootstrap another machine and use the [hey HTTP benchmark tool][hey] to send req
| 256 | 256 | all servers | 3061 | 119.3 |
[hey]: https://github.com/rakyll/hey
-[hack-benchmark]: /hack/benchmark/
+[hack-benchmark]: https://github.com/coreos/etcd/tree/master/hack/benchmark
