Update ch02-00-guessing-game-tutorial.md

[ayoubboumzebra]

correct the output of println!

println!("x = {x} and y + 2 = {}", y + 2);

This code would print x = 5 and y = 12." is incorrect.

Changed to

"This code would print x = 5 and y + 2 = 12." is correct

[mharsch]

This change looks good; it matches actual output and the intent of the example.

[zdf1230]

Found this while reading, thanks for doing this.

[ggirelli]

Also noticed this while reading, thanks for the PR! 🙏

[sarda-devesh]

Noticed this as well - thanks for saving me the effort of forking the repo.

[carols10cents]

Closing as a duplicate of #3462. Please check existing issues and PRs before opening new ones; thanks!