Update free-programming-books-langs.md (#10170)

* Update free-programming-books-langs.md

* fixing review comments

* removing unauthorized dist book

books/free-programming-books-langs.md

@@ -1390,8 +1390,10 @@ Books on general-purpose programming that don't focus on a specific language are
 
 ### Jenkins
 
+* [Jenkins Starter Guide Ebook](https://bugfender.com/wp-content/themes/bugfender-wordpress-theme/assets/docs/Jenkins-Starter-Guide-Ebook.pdf) (PDF)
 * [Jenkins: The Definitive Guide](http://www.bogotobogo.com/DevOps/Jenkins/images/Intro_install/jenkins-the-definitive-guide.pdf) (PDF)
 * [Jenkins User Handbook](https://www.jenkins.io/user-handbook.pdf) (PDF)
+* [Learning Jenkins](https://riptutorial.com/Download/jenkins.pdf) Compiled from StackOverflow Documentation (PDF)
 
 
 ### Julia