update docs

docs/20_Checks/check_clientbackup.md

docs/20_Checks/check_cronstatus.md

docs/20_Checks/check_disk_io.md

docs/20_Checks/check_dns_responsetime.md

docs/20_Checks/check_docker_info.md

docs/20_Checks/check_docker_stats.md

docs/20_Checks/check_dockercontainer_top.md

docs/20_Checks/check_eol.md

docs/20_Checks/check_fs_errors.md

docs/20_Checks/check_fs_writable.md

docs/20_Checks/check_gitlab_tokens.md

docs/20_Checks/check_haproxy_health.md

docs/20_Checks/check_haproxy_status.md

docs/20_Checks/check_http.md

docs/20_Checks/check_iml_backup_server.md

docs/20_Checks/check_journallog.md

docs/20_Checks/check_memory.md

docs/20_Checks/check_mysqlserver.md

docs/20_Checks/check_netio.md

docs/20_Checks/check_netstat.md