Test Functions Naming Scheme

The naming scheme in (The Rust Programming Language)[https://doc.rust-lang.org/book/ch11-01-writing-tests.html] uses the follwoing naming scheme for tests:

#[cfg(test)]
mod tests {
    #[test]
    fn foo() {
        assert!(true);
    }
}

But within (Rust By Example)[https://doc.rust-lang.org/rust-by-example/testing/unit_testing.html] it uses the following naming scheme for tests:

#[cfg(test)]
mod tests {
    #[test]
    fn test_foo() {
        assert!(true);
    }
}

Rust By Example should use the same naming scheme for tests, as The Rust Programming Language website.

Start with the Rust By Example unit testing page mentioned in the issue and compare its test naming example with The Rust Programming Language example. Update the displayed test function name to use the same scheme, then verify the rendered documentation shows the consistent example.