[dovecot/core] 6cda5e: man: document dsync -m and -R options

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/dovecot/core
  Commit: 6cda5e1a9bdbeaad9a6770adbcb538e5f60f0f42
      https://github.com/dovecot/core/commit/6cda5e1a9bdbeaad9a6770adbcb538e5f60f0f42
  Author: Michael M Slusarz <michael.slusarz at dovecot.fi>
  Date:   2016-02-08 (Mon, 08 Feb 2016)

  Changed paths:
    M doc/man/doveadm-sync.1.in

  Log Message:
  -----------
  man: document dsync -m and -R options