Avoid contraction

wiki/src/doc/first_steps/introduction_to_gnome_and_the_tails_desktop.mdwn

@@ -235,7 +235,7 @@ of your computer.
 
 <div class="caution">
 
-<p>If you remove your Tails USB stick while suspended, the computer won't
+<p>If you remove your Tails USB stick while suspended, the computer will not
 shut down immediately and will only shut down when resuming.</p>
 
 <p>An attacker with physical access to your computer and capable of finding