Move shortcut closer to the beginning

wiki/src/install/expert/usb.mdwn

@@ -8,6 +8,14 @@
 Verify the Tails signing key
 ============================
 
+<div class="tip">
+
+<p>If you already certified the Tails signing key with your own key, you
+can skip this step and start [[downloading and verifying the ISO
+image|usb#download]].</p>
+
+</div>
+
 In this step, you will download and verify the <em>Tails signing
 key</em> which is the OpenPGP key that is used to cryptographically sign
 the Tails ISO image.
@@ -23,14 +31,6 @@ OpenPGP Keys</a> by Riseup.</p>
 
 </div>
 
-<div class="tip">
-
-<p>If you already certified the Tails signing key with your own key, you
-can skip this step and start [[downloading and verifying the ISO
-image|usb#download]].</p>
-
-</div>
-
 1. Import the Tails signing key in your <span class="application">GnuPG</span> keyring:
 
        wget https://tails.boum.org/tails-signing.key