Guide: add a pointer to play.rust-lang.org #18968
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lnicola
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fix: `cargo rustc --print` needs `unstable-options`
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As-is, there's no indication that the code examples pop out into a window that runs on
play.rust-lang.orguntil you mouse over them. I managed to get to section 4 of the guide before realizing you could do this since it didn't occur to me to mouse over the example text.cc @rose since we went through the tutorial together and I think it wasn't obvious to her either.