correct Node Exporter download page address

Signed-off-by: zornlemma <zhou7yuan@gmail.com>

content/docs/guides/node-exporter.md

@@ -15,7 +15,7 @@ NOTE: While the Prometheus Node Exporter is for *nix systems, there is a [WMI ex
 
 ## Installing and running the Node Exporter
 
-The Prometheus Node Exporter is a single static binary that you can install [via tarball](#tarball-installation). Once you've downloaded it from the Prometheus [downloads page](/downloads#node_exporter) extract it, and run it:
+The Prometheus Node Exporter is a single static binary that you can install [via tarball](#tarball-installation). Once you've downloaded it from the Prometheus [downloads page](/download#node_exporter) extract it, and run it:
 
 ```bash
 wget https://github.com/prometheus/node_exporter/releases/download/v*/node_exporter-*.*-amd64.tar.gz