prometheus: update doc

doc/prometheus.md

@@ -1,6 +1,8 @@
 # Prometheus
 
-Prometheus is a systems and service monitoring system. It collects metrics from configured targets at given intervals, evaluates rule expressions, displays the results, and can trigger alerts when specified conditions are observed.
+[Prometheus] is a systems and service monitoring system. It collects metrics from configured targets at given intervals, evaluates rule expressions, displays the results, and can trigger alerts when specified conditions are observed.
+
+[Prometheus]: https://github.com/prometheus/prometheus
 
 ## Getting Started
 
@@ -17,11 +19,9 @@ Prometheus is a systems and service monitoring system. It collects metrics from
 {#scrape-configs}
 ### Adding Scrape Configs
 
-`scrape_configs`, controls what resources Prometheus monitor.
-
-Since Prometheus also exposes data about itself as an HTTP endpoint it can scrape and monitor its own health. In the [default example configuration](https://github.com/prometheus/prometheus/blob/3f686cad8bee405229b2532584ef181ce9f6a8b3/documentation/examples/prometheus.yml) there is a single job, called prometheus.
+`scrape_configs` controls what resources Prometheus monitors.
 
-To add `scrape_configs`, we can use the following config:
+Since Prometheus also exposes data about itself as an HTTP endpoint it can scrape and monitor its own health. In the [default example configuration](https://github.com/prometheus/prometheus/blob/3f686cad8bee405229b2532584ef181ce9f6a8b3/documentation/examples/prometheus.yml) there is a single job, called prometheus. We can add it to `scrape_configs` using the following config:
 
 ```nix
 {