Added examples for the new [xtrn_sec] eval_before/after_exec options.

ctrl/modopts.ini

@@ -41,6 +41,9 @@
 	clear_screen_on_exec = false
 ; Auto-execute the only available program when entering a program section
 	autoexec = false
+; Execute (evaluate) a JavaScript expression before/after executing any external programs (doors)
+;   eval_before_exec = alert('Running ' + prog.name);
+;   eval_after_exec = load('../xtrn/twitter/tweet.js', user.alias, 'ran', prog.name);
 
 [chat_sec]
 ; Over-ride default IRC server/port and channel (if desired) here: