Fix typo.

debian/changelog

@@ -27,7 +27,7 @@ tails (0.18) unstable; urgency=low
       which in turn makes Torbutton think it should start in non-Tor mode.
     · Also pass the TOR_SOCKS_* environment variables to iceweasel when
       generating the profile: Torbutton behaves differently depending on
-      these variables, so we don't want the initial profile generation do be
+      these variables, so we don't want the initial profile generation to be
       done without them. In practice, this has no implication that we could
       see right now, but better safe than sorry.
     · Import all version overrides from the TBB prefs.