fix(quiz2): add hint comment
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@ -16,6 +16,7 @@
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// - The input is going to be a Vector of a 2-length tuple,
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// the first element is the string, the second one is the command.
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// - The output element is going to be a Vector of strings.
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// Execute `rustlings hint quiz2` or use the `hint` watch subcommand for a hint.
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pub enum Command {
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Uppercase,
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