Mismatched variable name in ch17-05 code example

In the "The Future Trait" section of ch17-05, the current code shows:

let mut page_title_fut = page_title(url);
loop {
    match page_title_fut.poll() {
        Ready(value) => match page_title {  // Incorrect: `value` is matched but `page_title` is used
            Some(title) => println!("The title for {url} was {title}"),
            None => println!("{url} had no title"),
        }
        Pending => {
            // continue
        }
    }
}

It should be：

let mut page_title_fut = page_title(url);
loop {
    match page_title_fut.poll() {
        Ready(page_title) => match page_title {  // Fixed: Consistent naming
            Some(title) => println!("The title for {url} was {title}"),
            None => println!("{url} had no title"),
        }
        Pending => {
            // continue
        }
    }
}

Find the ch17-05 code example in the "The Future Trait" section and compare it with the issue's corrected snippet. Update the mismatched variable name, then build or render the book and confirm the example is consistent and valid.