Fix typo.

wiki/src/doc/about/fingerprint.mdwn

@@ -8,7 +8,7 @@ whether a particular user is using Tails or not.
 Tails it is possible to know that you are using Tor. But Tails tries to
 **make it as difficult as possible to distinguish Tails users from other
 Tor users**, especially users of <span class="application">Tor Browser</span> outside of Tails. If it is
-possible to determine whether your are a user of <span class="application">Tor Browser</span> inside or outside of Tails, this
+possible to determine whether you are a user of <span class="application">Tor Browser</span> inside or outside of Tails, this
 provides more information about you and in consequence reduces your
 anonymity.