update chapter 13 section 2 to reflect changes in #2797 #3071
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Before Rust 1.53, arrays did not implement `IntoIterator`, so listing 5-3 manually called `iter` to iterate over one using a `for` loop. PR rust-lang#2797 changed this, but did not update the wording in Chapter 13 Section 2 to reflect this change, creating a contradiction.
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Before Rust 1.53, arrays did not implement
IntoIterator, so listing 5-3 manually callediterto iterate over one using aforloop. PR #2797 changed this, but did not update the wording in Chapter 13 Section 2 to reflect this change, creating a contradiction.