documentation

Pull request #3298: ZBXNEXT-10143 formatting.

Merge in WEB/documentation from feature/ZBXNEXT-10143-7.0-D to release/7.0

* commit '3895e974701303b228e61599b5b8dbaa2077d0a0':
  ZBXNEXT-10143 added and changed sentences indicating feature introduction version, formatting.
  ZBXNEXT-10143 specified conditions for highlight whole row in prior versions, formatting.
  ZBXNEXT-10143 added an API changes entry.
  ZBXNEXT-10143 fixed formatting, removed redundant information.
  ZBXNEXT-10143 fixed formatting.
  ZBXNEXT-10143 added information about highlight whole row checkbox, updated screenshots.
  ZBXNEXT-10143 formatting.