Update README.md

Author: lizwar

README.md

@@ -32,7 +32,7 @@ The material covered in this book can be considered as key background for any st
 10. Software for SoCs
 
 ## License
-You are free to fork, clone or download this book in PDF format for personal, non-commerical use only. 
+You are free to fork, clone or download this book in PDF format for personal, non-commercial use only. 
 You may reprint or republish portions of the text for non-commercial, educational or research purposes but only if there is an attribution to Arm Education.
 
 ## Inclusive Language Commitment