add ML ref.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@7475 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -6,7 +6,7 @@ Mon Dec  6 17:32:38 2004  Tanaka Akira  <akr@m17n.org>
 
 	* rubyio.h, intern.h, io.c, file.c, process.c, ext/socket/socket.c,
 	  ext/pty/pty.c, ext/io/wait/wait.c, ext/openssl/ossl_ssl.c:
-	  Use own buffering mechanism instead of stdio.
+	  Use own buffering mechanism instead of stdio.  [ruby-dev:25056]
 
 	* io.c, ext/stringio/stringio.c, test/ruby/ut_eof.rb:
 	  EOF flag removed.