Have the bug6252 commit message reflect its on-again/off-again status

changes/bug6252 → changes/bug6252_again

@@ -4,5 +4,8 @@
       than our flow control would have allowed, or to gum up the network,
       or possibly to do targeted memory denial-of-service attacks on
       entry nodes. Fixes bug 6252. Bugfix on the 54th commit on Tor --
-      from July 2002, before the release of Tor 0.0.0.
+      from July 2002, before the release of Tor 0.0.0.  We had committed
+      this patch previously, but we had to revert it because of bug 6271.
+      Now that 6271 is fixed, this appears to work.
+