Update help text for file_names argument

Author: Alex-Jamshidi

implement-shell-tools/cat/cat.py

@@ -10,7 +10,7 @@
 
 parser.add_argument("-b", action="store_true", help="Numbers lines that aren't empty")
 parser.add_argument("-n", action="store_true", help="Numbers all lines")
-parser.add_argument("file_names", nargs="*", help="Files or folders to display")
+parser.add_argument("file_names", nargs="*", help="Files for which to display content")
 
 args = parser.parse_args()
 
@@ -62,4 +62,4 @@ def print_lines(all_files_contents):
       print(line)
 
 # ===== Run cat =====
-cat(parser.parse_args())
+cat(parser.parse_args())