documentation

Pull request #1071: Feature/ZBXNEXT-8330 7.0 D

Merge in WEB/documentation from feature/ZBXNEXT-8330-7.0-D to release/7.0

* commit '82dfdf8c28b02990a0b6aeb142e3d46d41a30b88':
  [ZBXNEXT-8330] fixed some inconsistencies
  [ZBXNEXT-8330] formatting fixes
  [ZBXNEXT-8330] multiple page updates
  fixed some typos
  [ZBXNEXT-8330] Default.* plugin parameters
  [ZBXNEXT-8330] updated Memchached, MongoDB, MySQL, Oracle, Redis plugin params
  [ZBXNEXT-8330] added Ceph configuration parameters
  [ZBXNEXT-8330] new default parameters for Zabbix agent 2