Fix typos in news (ko)

Author: yous

ko/news/_posts/2021-04-05-xml-round-trip-vulnerability-in-rexml-cve-2021-28965.md

@@ -1,6 +1,6 @@
 ---
 layout: news_post
-title: "CVE-2021-28965: REXML에서 XML 왕복 변환(round-trip) 취약점"
+title: "CVE-2021-28965: REXML의 XML 왕복 변환(round-trip) 취약점"
 author: "mame"
 translator: "yous"
 date: 2021-04-05 12:00:00 +0000

ko/news/_posts/2021-05-02-os-command-injection-in-rdoc.md

@@ -1,6 +1,6 @@
 ---
 layout: news_post
-title: "CVE-2021-31799: A command injection vulnerability in RDoc"
+title: "CVE-2021-31799: RDoc의 명령 주입 취약점"
 author: "aycabta"
 translator: "yous"
 date: 2021-05-02 09:00:00 +0000