Fix a typo in output message / remove duplicate parser assignment. [(…

…#1999)](GoogleCloudPlatform/python-docs-samples#1999)

* Fix a typo in output message.

Fixes a minor typo error in the `draw_hint` function. Because the tutorial is one of the starting points for new users, it's worth correcting it to avoid confusion.

* Remove duplicate `argparse` assignment.

`argparse.ArgumentParser()` was assigned twice in if statement so removed the duplicate.

samples/snippets/crop_hints/crop_hints.py

@@ -91,8 +91,6 @@ def crop_to_hint(image_file):
     parser.add_argument('mode', help='Set to "crop" or "draw".')
     args = parser.parse_args()
 
-    parser = argparse.ArgumentParser()
-
     if args.mode == 'crop':
         crop_to_hint(args.image_file)
     elif args.mode == 'draw':