amend the changelog entry for 4299

it doesn't have to do with small cells. rather, it has to do with
using cells to decide whether to mark the connection for close.

ChangeLog

 Changes in version 0.2.3.7-alpha - 2011-10-??
   o Major bugfix:
-    - Do not process cells on a marked-for-close connection. We previously
-      avoided this by not calling read handlers on marked connections, but
-      that's not adequate for the case when cells are very small. Fixes
-      bug 4299; bugfix on 0.2.0.20-rc which first made small cells possible.
+    - If we mark an OR connection for close based on a cell we process,
+      don't process any further cells on it. We already avoided reading
+      on marked-for-close connections, but now we also discard the cells
+      we'd already read. Fixes bug 4299; bugfix on 0.2.0.10-alpha, which
+      was the first version where we might mark a connection for close
+      based on processing a cell on it.
     - Fix a double-free bug that would occur when we received an invalid
       certificate in a CERT cell in the new v3 handshake. Fixes bug 4343;
       bugfix on 0.2.3.6-alpha.