adding metrics_path to snippet

Adding a change to the prometheus config snippet, it should contain:

metrics_path: '/metrics'

Putting the target url with the "/metrics" in it will prevent prometheus from loading.

Prometheus-Integration.md

@@ -20,6 +20,7 @@ Put the following into your Prometheus config:
   - job_name: 'uptime'
     scrape_interval: 30s
     scheme: http
+    metrics_path: '/metrics'
     static_configs:
       - targets: ['uptime-kuma.url']
     basic_auth: # Only needed if authentication is enabled (default) 
@@ -42,4 +43,4 @@ sum(monitor_response_time) by (monitor_name)
 sum(monitor_reponse_time{monitor_url="https://www.bbc.co.uk/"})
 # Show the current status of Google.com
 monitor_status{monitor_name="Google"}
-```
+```