Add a footnote about Cheese Shop in Doc/tutorial

[adorilson]

In previously versions, Brazilian team translation added a footnote explaining the origin from name Cheese Shop. We think this can be util for all languages.

[the-knights-who-say-ni]

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[csabella]

Thank you for the pull request!

This is the Travis error:

/home/travis/build/python/cpython/Doc/tutorial/whatnow.rst:75:Explicit markup ends without a blank line; unexpected unindent.

Please correct that for the CIs to pass.

[miss-islington]

Thanks @adorilson for the PR, and @matrixise for merging it 🌮🎉.. I'm working now to backport this PR to: 3.7.
🐍🍒⛏🤖

[matrixise]

Thank you so much for your contribution.

[bedevere-bot]

GH-13174 is a backport of this pull request to the 3.7 branch.