move linux fundamentals to correct category (#3883)

check_urls=free-programming-books.md
Signed-off-by: Ntechgaun <coolsamar207@gmail.com>

free-programming-books.md

@@ -979,7 +979,6 @@ Kerridge (PDF) (email address *requested*, not required)
 * [Getting Started with BASH](http://www.hypexr.org/bash_tutorial.php) (HTML)
 * [Google Shell Style Guide](https://google.github.io/styleguide/shell.xml) - Paul Armstrong (HTML)
 * [Introduction to the Command Line](https://launchschool.com/books/command_line) - Launch School (HTML)
-* [Linux Fundamentals](http://linux-training.be/linuxfun.pdf) - Paul Cobbaut (PDF)
 * [Linux Shell Scripting Tutorial - A Beginner's Handbook (2002)](http://www.freeos.com/guides/lsst/) - Vivek G. Gite (HTML)
 * [Linux Shell Scripting Tutorial (LSST) v2.0](https://bash.cyberciti.biz/guide/Main_Page) - Vivek Gite (HTML)
 * [Slackbook (2005)](http://slackbook.org) - Alan Hicks, Chris Lumens, David Cantrell and Logan Johnson (HTML, DocBook, Postscript, PDF)
@@ -1857,6 +1856,7 @@ Kerridge (PDF) (email address *requested*, not required)
 * [Linux Advanced Routing & Traffic Control HOWTO](http://lartc.org)
 * [Linux Device Drivers, Third Edition](http://lwn.net/Kernel/LDD3/) - Jonathan Corbet, Alessandro Rubini, and Greg Kroah-Hartman
 * [Linux from Scratch](http://www.linuxfromscratch.org/lfs/view/stable/)
+* [Linux Fundamentals](http://linux-training.be/linuxfun.pdf) - Paul Cobbaut (PDF)
 * [Linux Inside](https://www.gitbook.com/book/0xax/linux-insides/details)
 * [Linux Kernel in a Nutshell](http://www.kroah.com/lkn/)
 * [Linux Newbie Administrator Guide](http://lnag.sourceforge.net)