Update docs/book/v4/installation/faq.md

Co-authored-by: Alex Karajos <alex.merlin.1985@gmail.com>

Author: arhimede

docs/book/v4/installation/faq.md

@@ -23,7 +23,8 @@ chmod -R 777 data
 
 **Fix:**
 
-    chmod -R 777 public/uploads
+```shell
+chmod -R 777 public/uploads
 
 ### Error: