fixed syntax error

EXTRAS/example-configurations/conf.d/60-modules.yml

@@ -104,8 +104,8 @@ modules:
   #  welcome_message:
   #    subject: "Welcome!"
   #    body: |-
-        Hi.
-        Welcome to this XMPP server.
+  #      Hi.
+  #      Welcome to this XMPP server.
     ##
     ## When a user registers, send a notification to
     ## these XMPP accounts.