One more link to fix

Author: alexcrichton

_posts/2018-01-04-Rust-1.23.md

@@ -52,7 +52,7 @@ they've found.
 In other documentation news, historically, Cargo's docs have been a bit strange.
 Rather than being on https://doc.rust-lang.org, they've been at https://doc.crates.io.
 With this release, [that's changing](https://github.com/rust-lang/rust/pull/45692).
-You can now find Cargo's docs at [https://doc.rust-lang.org/cargo][]. Additionally, they've
+You can now find Cargo's docs at https://doc.rust-lang.org/cargo. Additionally, they've
 been converted to the same format as our other long-form documentation. We'll be
 adding a redirect from `doc.crates.io` to this page, and you can expect to see more
 improvements and updates to Cargo's docs throughout the year.