Add Fast.ai free course to Machine Learning section Add new resource (#13039)

* Add OSTEP to Operating Systems section

* Remove duplicate OSTEP entry

* Add Fast.ai free course to Machine Learning section

* Fix linter: remove trailing slash & adjust blank lines

* Fix blank lines between sections for linter

* Fix linter: remove extra blank lines in ML section

* Fix Machine Learning section formatting for linter

* Fix blank lines after Machine Learning section

* Fix blank lines after Machine Learning section

* Fix blank lines after Machine Learning section

* Fix blank lines after Machine Learning section

* Fix blank lines after Machine Learning section

* Fix blank lines after Machine Learning section

* Fix formatting: Add source and language for Fast.ai course

* Fix formatting: Add source and language for Fast.ai course

* Fix formatting: Add source and language for Fast.ai course

* Remove duplicate OSTEP entry and apply reviewer suggestion

Author: Anshul-Patidar

books/free-programming-books-subjects.md

@@ -468,6 +468,7 @@ Books that cover a specific programming language can be found in the [BY PROGRAM
 * [Neural Networks and Deep Learning](http://neuralnetworksanddeeplearning.com)
 * [Pattern Recognition and Machine Learning](https://www.microsoft.com/en-us/research/uploads/prod/2006/01/Bishop-Pattern-Recognition-and-Machine-Learning-2006.pdf) - Christopher M. Bishop (PDF)
 * [Patterns, Predictions, And Actions: A story about machine learning](https://mlstory.org/pdf/patterns.pdf) - Moritz Hardt, Benjamin Recht (PDF)
+* [Practical Deep Learning for Coders](https://course.fast.ai) - fast.ai
 * [Practitioners guide to MLOps](https://services.google.com/fh/files/misc/practitioners_guide_to_mlops_whitepaper.pdf) - Khalid Samala, Jarek Kazmierczak, Donna Schut (PDF)
 * [Probabilistic Machine Learning - An Introduction](https://github.com/probml/pml-book/releases/latest/download/book1.pdf) - Kevin P. Murphy (PDF)
 * [Python Machine Learning Projects](https://www.digitalocean.com/community/books/python-machine-learning-projects-a-digitalocean-ebook) - Lisa Tagliaferri, Brian Boucheron, Michelle Morales, Ellie Birkbeck, Alvin Wan (PDF, EPUB, Kindle)
@@ -790,7 +791,7 @@ Books that cover a specific programming language can be found in the [BY PROGRAM
 * [Linux Kernel in a Nutshell](http://www.linuxtopia.org/online_books/linux_kernel/kernel_configuration) - Greg Kroah-Hartman (HTML)
 * [Making Servers Work: A Practical Guide to Linux System Administration](https://www.digitalocean.com/community/books/sysadmin-ebook-making-servers-work) - Jamon Camisso (PDF, EPUB)
 * [Operating Systems: From 0 to 1](https://github.com/tuhdo/os01/releases/tag/0.0.1) - Tu, Ho Doang (PDF) ( :construction: *in process*)
-* [Operating Systems: Three Easy Pieces](https://pages.cs.wisc.edu/~remzi/OSTEP/) - Remzi H. Arpaci-Dusseau and Andrea C. Arpaci-Dusseau (PDF)
+* [Operating Systems: Three Easy Pieces](https://pages.cs.wisc.edu/~remzi/OSTEP/) - Remzi H. Arpaci-Dusseau, Andrea C. Arpaci-Dusseau (PDF)
 * [Practical File System Design: The Be File System](https://www.nobius.org/~dbg/practical-file-system-design.pdf) - Dominic Giampaolo (PDF)
 * [Project Oberon: The Design of an Operating System, a Compiler, and a Computer](https://people.inf.ethz.ch/wirth/ProjectOberon/index.html) - Niklaus Wirth, Jürg Gutknecht (PDF)
 * [The Art of Unix Programming](http://catb.org/esr/writings/taoup/html/) - Eric S. Raymond (HTML)