Clarified writing beyond the buffers end (#685)

blog/content/second-edition/posts/02-minimal-rust-kernel/index.md

@@ -337,7 +337,7 @@ Note that there's an [`unsafe`] block around all memory writes. The reason is th
 [`unsafe`]: https://doc.rust-lang.org/stable/book/ch19-01-unsafe-rust.html
 [four additional things]: https://doc.rust-lang.org/stable/book/ch19-01-unsafe-rust.html#unsafe-superpowers
 
-I want to emphasize that **this is not the way we want to do things in Rust!** It's very easy to mess up when working with raw pointers inside unsafe blocks, for example, we could easily write behind the buffer's end if we're not careful.
+I want to emphasize that **this is not the way we want to do things in Rust!** It's very easy to mess up when working with raw pointers inside unsafe blocks, for example, we could easily write beyond the buffer's end if we're not careful.
 
 So we want to minimize the use of `unsafe` as much as possible. Rust gives us the ability to do this by creating safe abstractions. For example, we could create a VGA buffer type that encapsulates all unsafety and ensures that it is _impossible_ to do anything wrong from the outside. This way, we would only need minimal amounts of `unsafe` and can be sure that we don't violate [memory safety]. We will create such a safe VGA buffer abstraction in the next post.