Update ch02-00-guessing-game-tutorial.md: Restated a link

[0xScratch]

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Whenever, a user kind of clicks on that enumeration link which is shown here:

We get hit on this link, which gives info about the coming chapter rather than the enumeration topic that one might want to look upon. So, I feel the correct one to make the user land be this

What's your say @carols10cents?