docs: Add documentation for ldap.port configuration option in authproc filters.

This is related to PR #313. The option was in use but not documented.

modules/ldap/docs/ldap.md

@@ -435,6 +435,17 @@ a listing of all configuration options and their details.
 		'ldap.hostname' => 'ad1.example.org ad2.example.org',
 
 
+		/**
+		 * This is the port where the LDAP server(s) listen for
+		 * connections.
+		 *
+		 * Default: 389
+		 * Required: No
+		 * AuthSource: port
+		 */
+		'ldap.port' => 389,
+
+
 		/**
 		 * This is the password used to bind to LDAP.
 		 *