Fix links that pointed to a redirection page (#447)

blog/content/second-edition/posts/03-vga-text-buffer/index.md

@@ -292,7 +292,7 @@ struct Buffer {
 ```
 Instead of a `ScreenChar`, we're now using a `Volatile<ScreenChar>`. (The `Volatile` type is [generic] and can wrap (almost) any type). This ensures that we can't accidentally write to it through a “normal” write. Instead, we have to use the `write` method now.
 
-[generic]: https://doc.rust-lang.org/book/generics.html
+[generic]: https://doc.rust-lang.org/book/second-edition/ch10-00-generics.html
 
 This means that we have to update our `Writer::write_byte` method:
 
@@ -543,7 +543,7 @@ Note that we only have a single unsafe block in our code, which is needed to cre
 ### A println Macro
 Now that we have a global writer, we can add a `println` macro that can be used from anywhere in the codebase. Rust's [macro syntax] is a bit strange, so we won't try to write a macro from scratch. Instead we look at the source of the [`println!` macro] in the standard library:
 
-[macro syntax]: https://doc.rust-lang.org/nightly/book/macros.html
+[macro syntax]: https://doc.rust-lang.org/nightly/book/second-edition/appendix-04-macros.html
 [`println!` macro]: https://doc.rust-lang.org/nightly/std/macro.println!.html
 
 ```rust