fix subject cat

subjects/cat.en.md

@@ -24,9 +24,9 @@ Write a program that has the same behaviour as the system's `cat` command-line.
 
 ```console
 student@ubuntu:~/piscine-go/cat$ go build
-student@ubuntu:~/piscine-go/cat$ ./cat
-Hello
+student@ubuntu:~/piscine-go/cat$ ./cat Hello There
 Hello
+There
 student@ubuntu:~/piscine-go/cat$ ./cat quest8.txt
 "Programming is a skill best acquired by pratice and example rather than from books" by Alan Turing
 student@ubuntu:~/piscine-go/cat$ ./cat quest8.txt quest8T.txt

subjects/cat.fr.md

@@ -26,9 +26,9 @@
 
 ```console
 student@ubuntu:~/piscine-go/cat$ go build
-student@ubuntu:~/piscine-go/cat$ ./cat
-Hello
+student@ubuntu:~/piscine-go/cat$ ./cat Hello There
 Hello
+There
 student@ubuntu:~/piscine-go/cat$ ./cat quest8.txt
 "Programming is a skill best acquired by pratice and example rather than from books" by Alan Turing
 student@ubuntu:~/piscine-go/cat$ ./cat quest8.txt quest8T.txt