final (?) changelog tweaks

ChangeLog

-Changes in version 0.3.3.3-alpha - 2018-03-??
+Changes in version 0.3.3.3-alpha - 2018-03-03
   Tor 0.3.3.3-alpha is the third alpha release for the 0.3.3.x series.
   It includes an important security fix for a remote crash attack
   against directory authorities tracked as TROVE-2018-001.
@@ -13,9 +13,10 @@ Changes in version 0.3.3.3-alpha - 2018-03-??
   This release also fixes several minor bugs and annoyances from
   earlier releases.
-  All directory authorities should upgrade to one of the versions
-  released today.  All relays not already running Tor 0.3.3.2-alpha or
-  later should upgrade to one of the versions released today.
+  Relays running 0.3.2.x should upgrade to one of the versions released
+  today, for the fix to TROVE-2018-002.  Directory authorities should
+  also upgrade. (Relays on earlier versions might want to update too for
+  the DoS mitigations.)
   o Major bugfixes (denial-of-service, directory authority):
     - Fix a protocol-list handling bug that could be used to remotely crash