Add highlighting to last code-block

SC1044.md

@@ -20,8 +20,10 @@ The `<<` here document (aka heredoc) was not properly terminated. The terminatin
 
 Note that you can not put here documents in one liners. For such use cases, use a `<<<` here string:
 
+```sh
 cat << EOF  hello world  EOF   # Wrong: data and terminator can not be on the same line
 cat <<< "hello world"          # Correct
+```
 
 ### Exceptions: