documentation

Pull request #3734: [ZBXNEXT-4769] customizable host name display; items selection and broadcasting for Graph and Scatter plot

Merge in WEB/documentation from feature/ZBXNEXT-4769-7.5-D to release/8.0

* commit '84a0c343f3a9852fcd65e61897d02d913c6fd555':
  [ZBXNEXT-4769] removed duplicate entry
  Merge branch 'release/8.0' of https://git.zabbix.com/scm/web/documentation into feature/ZBXNEXT-4769-7.5-D
  [ZBXNEXT-4769] updated descriptions for Graph and Scatter plot
  [ZBXNEXT-4769] updated Scatter plot image
  [ZBXNEXT-4769] updated wording and formatting
  [ZBXNEXT-4769] updated information about tooltips in What's New
  [ZBXNEXT-4769] updated wording
  [ZBXNEXT-4769] minor formatting changes
  [ZBXNEXT-4769] updated description for Graph and Scatter plot
  [ZBXNEXT-4769] resized images
  [ZBXNEXT-4769] updated wording
  [ZBXNEXT-4769] updated description for Graph and Scatter plot; What's New page
  [ZBXNEXT-4769] updated samples of broadcasting widgets
  [ZBXNEXT-4769] updated Graph and Scatter plot widgets compatibility
  [ZBXNEXT-4769] customizable host name display in widget labels