`Context` for Quiz `Question 3` in Section 2 of Chapter 13 has a typo

[hamirmahal]

• I have searched open and closed issues and pull requests for duplicates, using these search terms:
  • ch13 quiz typo
  • does not need to be dereferences
• I have checked the latest main branch to see if this has already been fixed, in this file:
  • quizzes/ch13-02-iterators.toml

URL to the section(s) of the book with this problem: https://rust-book.cs.brown.edu/ch13-02-iterators.html#using-closures-that-capture-their-environment

Description of the problem: The Context for Question 3 has typo.

Therefore the closure in map takes &i32 as input. The multiplication operator is implemented for &i32, so x does not need to be dereferences in x 2.

Suggested fix: Change the above sentence like so.

Therefore the closure in map takes &i32 as input. The multiplication operator is implemented for &i32, so x does not need to be dereferenced in x 2.

[hamirmahal]