Improve relabel config documentation (#286)

Improve the clarity of how to use the relabel config to adjust the
blackbox exporter target.

diff --git a/README.md b/README.md
index 35159e6227d8da15d48ab1a965b7cbba294cbd74..53713296c51f738a5541c3274b3a3f5a5eb8479a 100644 (file)
--- a/README.md
+++ b/README.md
@@ -66,7 +66,7 @@ scrape_configs:
       - source_labels: [__param_target]
         target_label: instance
       - target_label: __address__
-        replacement: 127.0.0.1:9115  # Blackbox exporter.
+        replacement: 127.0.0.1:9115  # The blackbox exporter's real hostname:port.
 ```
 
 ## Permissions