documentation

Pull request #1954: feature/ZBXNEXT-8656-7.2-D. added PubkeyAcceptedKeyTypes SSH item key option.

Merge in WEB/documentation from feature/ZBXNEXT-8656-7.2-D to release/7.2

* commit '458f15cce7f2b3e200a97800e29dda710c9d756b':
  [ZBXNEXT-8658] removed SSH option support
  [ZBXNEXT-8656] specified SSH option support
  [ZBXNEXT-8656] added PubkeyAcceptedKeyTypes SSH item key option