do some review feedback

Author: steveklabnik

_posts/2018-10-29-help-test-rust-2018.md

@@ -2,10 +2,13 @@
 title: "Help test Rust 2018"
 ---
 
-Back in July, we talked about ["Rust 2018"]. In short, we're adding a new
-concept to Rust, "Editions." Editions are a way of showing larger progress
-than our six-week release cycle, and will happen on a roughly three-year
-cycle. Rust 1.0 was "Rust 2015," and Rust 1.31 will be "Rust 2018."
+Back in July, we talked about ["Rust 2018"]. In short, we are launching a
+cycle of long-term milestones called "Editions". Editions are a way to
+capture the progress delivered incrementally by our ordinary six-week release
+cycle -- and focus Rust libraries, tooling, and documentation cohesively
+around it. Editions will be selected roughly every three years: Rust 1.0 was
+"Rust 2015" and Rust 1.31 will be "Rust 2018". Each edition has a theme;
+Rust 2015's was "stability", and Rust 2018's is "productivity."
 
 We've been [testing Rust 2018 for a while already], and things are looking
 pretty good! We have just under six weeks until Rust 1.31 ships, and so
@@ -29,7 +32,7 @@ helping us make Rust even better. <3
 ## Setup: install Rust beta
 
 First things first, you'll need to install the beta release channel of Rust.
-With Rustup, it's as easy as:
+With [Rustup], it's as easy as:
 
 ```console
 $ rustup install beta
@@ -46,6 +49,8 @@ $ cargo +beta build
 This lets you stick to stable as the default, while using beta for your
 experiments.
 
+[Rustup]: https://www.rust-lang.org/en-US/install.html
+
 ## Start a new project
 
 To start a new project with Rust 2018: