Use I_OnUserQuit for os_session because I_OnPreUserLogoff gets called too late, after the users server can be gone. Fix a couple other small things

data/modules.example.conf

@@ -463,7 +463,7 @@ module { name = "help" }
  * This module allows granting users services operator privileges and possibly IRC Operator
  * privileges based on an external SQL database using a custom query.
  */
-module
+#module
 {
 	name = "m_sql_oper"
 
@@ -560,7 +560,7 @@ module { name = "m_rewrite" }
  *
  * This module uses SSL to connect to the uplink server(s).
  */
-module
+#module
 {
 	name = "m_ssl"