[dovecot/core] aa2eb4: man: Document doveadm mailbox cache commands

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/dovecot/core
  Commit: aa2eb418d94642e996dc64e7400acc9d3069da9f
      https://github.com/dovecot/core/commit/aa2eb418d94642e996dc64e7400acc9d3069da9f
  Author: Aki Tuomi <aki.tuomi at dovecot.fi>
  Date:   2018-04-26 (Thu, 26 Apr 2018)

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

  Log Message:
  -----------
  man: Document doveadm mailbox cache commands