Update Doku aus Driversourcen

Change-Id: I455f0813b970151089b3dc1b8d9407eea323cdd1
diff --git a/doc/master/notify_shutdown b/doc/master/notify_shutdown
index d23cd98..7fd24cc 100644
--- a/doc/master/notify_shutdown
+++ b/doc/master/notify_shutdown
@@ -11,7 +11,7 @@
         done when remove_player() is called because the udp connectivity is
         already gone then.
 
-        If the gamedriver shuts down normally , this is the last function
+        If the gamedriver shuts down normally, this is the last function
         called before the mud shuts down the udp connections and the accepting
         socket for new players.