Improved wording in documentation regarding admin.py

[jasonbest@…]

In the docs at ​https://docs.djangoproject.com/en/1.5/intro/tutorial02/#make-the-poll-app-modifiable-in-the-admin the tutorial says "To do this, open the polls/admin.py file, and edit it to look like this.." but at this point in the tutorial, that file does not exist yet. I think it would be more clear to say "To do this, create a new file named admin.py in the polls/ directory, and edit it to look like this:". The end of that section does acknowledge that this is a new file because it says "...the action of creating a new file doesn’t trigger the auto-reloading logic."

Thanks!

[Aymeric Augustin]

See #20334.