[dovecot/core] 2dc6c0: example-config: Update deliver_log_format comment

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/dovecot/core
  Commit: 2dc6c073d4f0f4012b7a5a6cf800a07caaa2e9dd
      https://github.com/dovecot/core/commit/2dc6c073d4f0f4012b7a5a6cf800a07caaa2e9dd
  Author: Timo Sirainen <timo.sirainen at dovecot.fi>
  Date:   2017-03-02 (Thu, 02 Mar 2017)

  Changed paths:
    M doc/example-config/conf.d/10-logging.conf

  Log Message:
  -----------
  example-config: Update deliver_log_format comment