Fix links for book editions.

src/rust-2018/documentation/new-editions-of-the-book.md

@@ -1,10 +1,8 @@
 # New editions of the "the book"
 
-![Minimum Rust version: 1.18](https://img.shields.io/badge/Minimum%20Rust%20Version-1.18-red.svg) for drafts of the second edition
-
 ![Minimum Rust version: 1.26](https://img.shields.io/badge/Minimum%20Rust%20Version-1.26-brightgreen.svg) for the final version of the second edition
 
-![Minimum Rust version: 1.28](https://img.shields.io/badge/Minimum%20Rust%20Version-1.28-red.svg) for drafts of the 2018 edition
+![Minimum Rust version: 1.31](https://img.shields.io/badge/Minimum%20Rust%20Version-1.31-brightgreen.svg) for the 2018 edition
 
 We've distributed a copy of "The Rust Programming Language," affectionately
 nicknamed "the book", with every version of Rust since Rust 1.0.
@@ -15,23 +13,19 @@ details were nailed down for the 1.0 release. It didn't do a fantastic job of
 teaching lifetimes.
 
 Starting with Rust 1.18, we shipped drafts of a second edition of the book.
-The final version was shipped with Rust 1.26. The new edition is a complete
+The final version was shipped with Rust 1.26. The second edition is a complete
 re-write from the ground up, using the last two years of knowledge we’ve
-gained from teaching people Rust. You’ll find brand-new explanations for a
-lot of Rust’s core concepts, new projects to build, and all kinds of other
-good stuff. Please [check it
-out](https://doc.rust-lang.org/book/second-edition/index.html) and let us
+gained from teaching people Rust.
+
+You can purchase [a printed version of the second edition from No Starch
+Press](https://nostarch.com/Rust). Now that the print version has shipped, the
+second edition is frozen.
+
+As of 1.31, the book has been completely updated for the 2018 Edition release.
+It's still pretty close to the second edition, but contains information about
+newer features since the book's content was frozen. Additionally, instead of
+publishing separate editions of the book, only the latest version of the book
+is published online. You’ll find brand-new explanations for a lot of Rust’s
+core concepts, new projects to build, and all kinds of other good stuff.
+Please [check it out](https://doc.rust-lang.org/book/index.html) and let us
 know what you think!
-
-You can also purchase [a dead-tree version from No Starch
-Press](https://nostarch.com/Rust). Now that the print version has shipped,
-the second edition is frozen.
-
-The names are a bit confusing though, because the "second edition" of the
-book is the first printed edition of the book. As such, we decided that newer
-editions of the book will correspond with newer editions of Rust itself, and
-so starting with 1.28, we've been shipping drafts of the next version, [the
-2018 Edition](https://doc.rust-lang.org/book/2018-edition/index.html). It's
-still pretty close to the second edition, but contains information about
-newer features since the book's content was frozen. We'll be continuing to
-update this edition until we decide to print a second edition in paper.

src/rust-2018/trait-system/more-container-types-support-trait-objects.md

@@ -3,7 +3,7 @@
 ![Minimum Rust version: 1.2](https://img.shields.io/badge/Minimum%20Rust%20Version-1.2-brightgreen.svg)
 
 In Rust 1.0, only certain, special types could be used to create [trait
-objects](https://doc.rust-lang.org/book/second-edition/ch17-02-trait-objects.html).
+objects](https://doc.rust-lang.org/book/ch17-02-trait-objects.html).
 
 With Rust 1.2, that restriction was lifted, and more types became able to do this. For example,
 `Rc<T>`, one of Rust's reference-counted types:
@@ -14,7 +14,7 @@ use std::rc::Rc;
 trait Foo {}
 
 impl Foo for i32 {
-    
+
 }
 
 fn main() {
@@ -25,4 +25,4 @@ fn main() {
 This code would not work with Rust 1.0, but now works.
 
 > If you haven't seen the `dyn` syntax before, see the section on it. For
-> versions that do not support it, replace `Rc<dyn Foo>` with `Rc<Foo>`.
+> versions that do not support it, replace `Rc<dyn Foo>` with `Rc<Foo>`.