documentation

Pull request #2093: Feature/ZBXNEXT-9199 7.2 D

Merge in WEB/documentation from feature/ZBXNEXT-9199-7.2-D to release/7.2

* commit '7d11872ad33c9c14d4a81515f98f89a071ad4245':
  formatting fix
  formatting fix
  grammar fix
  improved Top hosts entry (ZBXNEXT-9199)
  more precise column configuration section
  updated top hosts image
  formatting fix
  Top hosts widget improvements (ZBXNEXT-9199)
  improved top hosts widget page (ZBXNEXT-9199)
  Added what's new entry for Top hosts (ZBXNEXT-9199)
  described new column control for Top Hosts (ZBXNEXT-9199)
  Improved column control in Top hosts (ZBXNEXT-9199)