update mtgdoc index page

mtgdoc.html

@@ -10,7 +10,9 @@
 <h1>This is the root of mtgdoc.link</h1>
 <p>MTGDoc.link is a redirection service providing simple shorthand links to the most up-to-date versions of various rules resources for Magic: the Gathering. It's part of the <a href="https://academyruins.com"/>Academy Ruins</a> project.</p>
 
-<p>You can use any of the following resource names as either a path segment or a subdomain. For more information, see the Academy Ruins <a href="https://api.academyruins.com/docs#tag/Redirects">API docs</a>.
+<p>You can use any of the following resource names as either a path segment or a subdomain. For example, if you want to get to the IPG, you can go to either <a href="https://mtgdoc.link/ipg">https://mtgdoc.link/ipg</a>, or to <a href="https://ipg.mtgdoc.link">https://ipg.mtgdoc.link</a>.</p>
+
+<p>For more information, see the Academy Ruins <a href="https://api.academyruins.com/docs#tag/Redirects">API docs</a>.</p>
 
 <p><b>Currently supported official documents:</b></p>
 <ul>