docs: Fix location of libvirt.conf and auth.conf

For a unprivileged user libvirt.conf and auth.conf are looked up in
$XDG_CONFIG_HOME but the docs incorrectly state that it's $XDG_CONFIG_DIR.

docs/auth.html.in

@@ -25,7 +25,7 @@ for the authentication file using the following sequence:
         variable.</li>
       <li>The file path specified by the "authfile=/some/file" URI
         query parameter</li>
-      <li>The file $XDG_CONFIG_DIR/libvirt/auth.conf</li>
+      <li>The file $XDG_CONFIG_HOME/libvirt/auth.conf</li>
       <li>The file /etc/libvirt/auth.conf</li>
     </ol>
 

docs/uri.html.in

@@ -30,7 +30,7 @@ virConnectPtr conn = virConnectOpenReadOnly (<b>"test:///default"</b>);
     <p>
 To simplify life for administrators, it is possible to setup URI aliases in a
 libvirt client configuration file. The configuration file is <code>/etc/libvirt/libvirt.conf</code>
-for the root user, or <code>$XDG_CONFIG_DIR/libvirt/libvirt.conf</code> for any unprivileged user.
+for the root user, or <code>$XDG_CONFIG_HOME/libvirt/libvirt.conf</code> for any unprivileged user.
 In this file, the following syntax can be used to setup aliases
     </p>