documentation

Pull request #65: [ZBXNEXT-7411] - 6.0 - Runtime commands supported on *BSD OS

Merge in WEB/documentation from feature/ZBXNEXT-7411-6.0-D to release/6.0

* commit '94aa650dadbc38aa7c6b0fed35fec1511bd6b621':
  server.md more precise description
  proxy.md more precise description
  proxy.md removed outdated note
  server.md fixed list of commands supported on BSD, removed outdated note.
  proxy.md fixed the list of commands supported on BSD systems
  whatsnew600.md minor wording fixes
  proxy.md fixing table syntax
  Runtime commands support on *BSD systems