rollup merge of #23745: oneeman/trpl-looping
rollup merge of #23745: oneeman/trpl-looping

Was reading the 'Looping' section of the book and was puzzled why the last example uses `0u32..10` when the others don't.  Tried it out without and it seems to work, so I figured it should just be `0..10`.  If there is a reason it needs to be `0u32..10` it should be explained in the text (I'd offer to do it but I have no idea).

r? @steveklabnik

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