documentation

Pull request #529: ZBXNEXT-7512 6.4 Enhanced context menu

Merge in WEB/documentation from feature/ZBXNEXT-7512-6.4-D to release/6.4

* commit '2b068d3f61a43d5725e2bcc1ebcad66915f7dc73': (23 commits)
  ZBXNEXT-7512 Edited formatting on Whatsnew page.
  ZBXNEXT-7512 Edited Whatsnew and Item menu pages.
  ZBXNEXT-7512 Edited Whatsnew and Menu pages.
  ZBXNEXT-7512 Edited the link on Items page.
  [ZBXNEXT-7512] Updated context menu descriptions
  [ZBXNEXT-7512] updated What's new in 6.4.0
  ZBXNEXT-7512 Edited image and 3 pages.
  ZBXNEXT-7512 Edited images on Item and Host menu.
  ZBXNEXT-7512 Edited 5 pages.
  ZBXNEXT-7512 Edited 6 pages.
  ZBXNEXT-7512 Edited 5 pages.
  ZBXNEXT-7512 Partially revised 5 pages.
  ZBXNEXT-7512 Edited formatting on Event menu p.
  ZBXNEXT-7512 Edited Whatsnew page.
  ZBXNEXT-7512 Edited 5 pages.
  ZBXNEXT-7512 Edited Event menu page.
  ZBXNEXT-7512 Edited Whatsnew page.
  ZBXNEXT-7512 Updated Host and Events menu pages.
  ZBXNEXT-7512 Partially updated Host menu page.
  ZBXNEXT-7512 Updated Latest data page.
  ...