documentation

Pull request #1006: feature/ZBXNEXT-8086-7.0-D-DEV: Ability to use all widgets on template dashboards (updates to Developer Center).

Merge in WEB/documentation from feature/ZBXNEXT-8086-7.0-D-DEV to release/7.0

* commit '9ac1455c53e6a13ea1cbd796952c84abf9ef2158':
  [ZBXNEXT-8086] Updated 8086 entry wording, fixed grammar
  [ZBXNEXT-8086] Ability to use all widgets on template dashboards (updates to Developer Center)