Fixed #1509 -- Added clear documentation in tutorial 1 docs to avoid confusion

[nandanak]

Modified the tutorial 1 documentation on the polls app. (django#1509)

There was a possibility of confusion to occur that the user might create a new "urls.py" file in the root "mysite" directory instead of adding code into the existing "urls.py" file inside the inner "mysite" directory, in the sentence

The next step is to point the root URLconf at the polls.urls module. In mysite/urls.py, add an import for django.urls.include and insert an include() in the urlpatterns list, so you have...

[github-actions]

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[sarahboyce]

Thank you @nandanak, I find the docs already quite clear and I would want to hear that a beginner actually found it confusing instead of "this is possibly confusing" before considering making an update 👍