[tz] Rule Russia incorrect

[Robert Elz]

    Date:        Mon, 31 Oct 2011 16:27:37 +0100
    From:        Petr Machata <pmachata at redhat.com>
    Message-ID:  <m28vo1tc46.fsf at redhat.com>

  | So on Mar 27, Moscow stopped observing ruleset Russia, and instead
  | changed to permanent offset of +4:00.

Yes, that description is much better than my version with the offsets all 
incorrect...

kre