Fix typo

wiki/src/contribute/mission.html

@@ -139,7 +139,7 @@ is less secure.</strong></p>
 <h3>No bullshit</h3>
 
 <p>We don't promise absolute security but
-are we reliable and trustworthy. We communicate about the limitations of
+we are reliable and trustworthy. We communicate about the limitations of
 our software in an instructive way, without being disorientating,
 patronizing, or overly cautious. <strong>Tails is safe but not
 magic.</strong></p>