some more improvements to comments

ex1/b.py

@@ -16,10 +16,9 @@ parser.add_argument(
 # Execute parsing
 args = parser.parse_args()
 
-# Verifica massimo 3 valori
+# Check if arguments are more than expected
 if len(args.target) > 3:
     print("Error: can be used **at max 3** values from 'toto', 'tata' and 'titi'.", file=sys.stderr)
     sys.exit(1)
 
-# Tutto OK
 print("You've written:", args.target)

ex1/c.py

@@ -1,8 +1,9 @@
 import sys
 import pyfiglet
 
+# check if executed without text and print help
 if len(sys.argv) < 2:
-    print("Usage: python script.py 'text to be converted'")
+    print("Usage: python c.py 'text to be converted'")
     sys.exit(1)
 
 text = " ".join(sys.argv[1:])