Fix the course links to new versions (#7275)

* Update free-courses-ko.md

* Update free-courses-ko.md

* Fixing author syntax

Co-authored-by: David Ordás <3125580+davorpa@users.noreply.github.com>

courses/free-courses-ko.md

@@ -108,7 +108,7 @@
 
 ### Git
 
-* [지옥에서 온 Git](https://www.opentutorials.org/course/2708) (생활코딩)
+* [GIT1](https://www.opentutorials.org/course/3837) - 생활코딩
 
 
 ### Go