Two more How-Do-I entries for shell shortcuts

(I’m just picking the low-hanging fruit here before girding my loins and plunging in to the deep waters of Shell extensions!). Just added two more How-do-I entries, one for general shortcuts, the other for the URL shortcuts. (Although I’m not entirely sure what you achieve with a URL shortcut that you don’t achieve with a normal shortcut that has a URL target). You can find them and the other entries on my Win32-How-do-I pages.