Note on fix

doc/bugs/cannot_preview_shortcuts.mdwn

@@ -2,3 +2,9 @@ Shortcuts such as \[[!google foo]] do not work when previewing pages.
 --[[JasonBlevins]]
 
 > Broken during the setup dumping changes, now fixed. --[[Joey]] [[done]]
+
+>> Just a quick note that this fix interacts with the way the `listdirectives`
+>> directive gets its list of non-shortcut directives.  At the moment it
+>> still works, but it relies on the fact that the `listdirectives` `checkconfig`
+>> hook is called before the `shortcut` `checkconfig` hook.
+>> -- [[Will]]