add a korean course link (#6342)

* fix to mistyping 

AWK guide subject mistyping as AWS

* add a ebook link for about springboot

* update an author

* delete an author email address

* add a course for python

* add a korean course link

* Update courses/free-courses-ko.md

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

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

courses/free-courses-ko.md

@@ -165,6 +165,7 @@
 ### Linux
 
 * [리눅스 및 커널 프로그래밍](http://www.kocw.net/home/search/kemView.do?kemId=1266434) (금오공대 최태영)
+* [Linux Kernel Basic](https://jihooyim1.gitbooks.io/linuxbasic/content) - Jihoo Yim (gitbook)
 
 
 ### Machine Learning