Add missing docstrings

.gitlint

+[general]
+ignore=body-is-missing

run-speedtest.py

 #!/usr/bin/python3
+"""Export speedtest up- and download speed metrics to prometheus."""
+
 
 import socket
 import speedtest
 import time
-from prometheus_client import start_http_server, Summary, Gauge
+from prometheus_client import start_http_server, Gauge
 
 servers = []
 # If you want to test against a specific server
@@ -18,6 +20,7 @@ g_upload = Gauge('upload_speed', 'Upload speed')
 
 
 def process_request(t):
+    """Measure up- and download speed using speedtest."""
     s.get_servers(servers)
     s.get_best_server()
     s.download()