fix build (#6611)

* new branch for misc cleanup

* add item to resolve #6319

* fix grammar

* re-collate

books/free-programming-books-ar.md

@@ -24,9 +24,9 @@
 
 ### Arduino
 
-* [AVR ببساطة: من تشغيل دايود ضوئي إلى أنظمة الوقت الحقيقي](https://github.com/abdallah-ali-abdallah/Simply-AVR-Book) - عبدالله علي عبدالله, Abdallah Ali Abdallah Elmasry (ODT, PDF)
 * [احترف الأردوينو](https://www.ev-center.com/uploads/2/1/2/6/21261678/arduino.pdf) - Working Group (PDF)
 * [اردوينو ببساطة](https://simplyarduino.com/%D9%83%D8%AA%D8%A7%D8%A8-%D8%A7%D8%B1%D8%AF%D9%88%D9%8A%D9%86%D9%88-%D8%A8%D8%A8%D8%B3%D8%A7%D8%B7%D8%A9/) - عبدالله علي عبدالله, Abdallah Ali Abdallah Elmasry (PDF)
+* [AVR ببساطة: من تشغيل دايود ضوئي إلى أنظمة الوقت الحقيقي](https://github.com/abdallah-ali-abdallah/Simply-AVR-Book) - عبدالله علي عبدالله, Abdallah Ali Abdallah Elmasry (ODT, PDF)
 
 
 ### Artificial Intelligence

books/free-programming-books-subjects.md

@@ -1,7 +1,6 @@
 ## BY SUBJECT
 
 This list, organized by subject, is for books that cover a programming-related subject in a programming-language agnostic way.  
-Books that cover a specific programming language can be found in the  [BY PROGRAMMING LANGUAGE file](free-programming-books-langs.md) list.
 Books that cover a specific programming language can be found in the  [BY PROGRAMMING LANGUAGE](free-programming-books-langs.md) list.