Translate Complete(kr) : Action Cable Overview

[yhk1038]

Summary

Translated to korean for ActionCable Overview based on rails new version 5.2

Other Information

• based repository rorlakr/rails-guides
• based branch 5.2-ko
• a file changed: ~/guide/source/ko/action_cable_overview.md
• original guide: Action Cable Overview - Ruby on Rails Guides v5.2

[wagurano]

읽고 있습니다. 주말 중에 의견 남기겠습니다. 좀 더 기다려주세요.