The defaults stated in the example config where wrong (#2110)

* The stated defaults where wrong

* Update prometheus.yml

documentation/examples/prometheus.yml

@@ -1,7 +1,7 @@
 # my global config
 global:
-  scrape_interval:     15s # By default, scrape targets every 15 seconds.
-  evaluation_interval: 15s # By default, scrape targets every 15 seconds.
+  scrape_interval:     15s # Set the scrape interval to every 15 seconds. Default is every 1 minute.
+  evaluation_interval: 15s # Evaluate rules every 15 seconds. The default is every 1 minute.
   # scrape_timeout is set to the global default (10s).
 
   # Attach these labels to any time series or alerts when communicating with
@@ -20,9 +20,6 @@ scrape_configs:
   # The job name is added as a label `job=<job_name>` to any timeseries scraped from this config.
   - job_name: 'prometheus'
 
-    # Override the global default and scrape targets from this job every 5 seconds.
-    scrape_interval: 5s
-
     # metrics_path defaults to '/metrics'
     # scheme defaults to 'http'.