documentation

Pull request #963: Feature/ZBX-22390 6.4 D

Merge in WEB/documentation from feature/ZBX-22390-6.4-D to release/6.4

* commit 'cd0dc4b952a1dca75b5c73b9de2c151d64aacbc5':
  / removed
  proxy_config_cache_reload command added, vers 6.4
  copypaste error fixed v6.4
  manpages zabbix_server edit v6.4