chore(iterators2): Add exercise instructions
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// iterators2.rs
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// In this module, you'll learn some of unique advantages that iterators can offer
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// Step 1. Complete the `capitalize_first` function to pass the first two cases
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// Step 2. Apply the `capitalize_first` function to a vector of strings, ensuring that it
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// Step 2. Apply the `capitalize_first` function to a vector of strings, ensuring that it returns a vector of strings as well
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// Step 3. Apply the `capitalize_first` function again to a list, but try and ensure it returns a single string
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// As always, there are hints below!
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