Turn modules into a mapping.

Introduction

@@ -225,7 +225,10 @@ binary_port	mapping	A mapping containing host:port pairs, where the host
 		number	number is a port on which to accept raw TCP/IP
 			connections.  Alternatively, a binary port number.
 directory	string	The base directory for the system.
-modules		string*	An array of runtime extension modules (optional).
+modules		mapping	A mapping containing module:config pairs, where the 
+			module string is the path of a runtime extension
+			module, and the config string is used to initialize it.
+			(optional)
 users		number	The maximum number of active telnet and binary
 			connections.
 editors		number	The maximum number of simultaneously active