Update posts/2018-12-20-Rust-1.31.1.md

Co-Authored-By: steveklabnik <steve@steveklabnik.com>

Author: Mark-Simulacrum

posts/2018-12-20-Rust-1.31.1.md

@@ -25,9 +25,9 @@ appropriate page on our website, and check out the [detailed release notes for
 
 This patch release fixes a build failure on on `powerpc-unknown-netbsd` by
 way of [an update to the `libc`
-crate](https://github.com/rust-lang/rust/pull/56562).
+crate](https://github.com/rust-lang/rust/pull/56562) used by the compiler.
 
 Additionally, the Rust Language Server was updated to fix two critical bugs:
 
 * <https://github.com/rust-lang/rls/issues/1171>
-* <https://github.com/rust-lang/rls/pull/1170>
+* <https://github.com/rust-lang/rls/pull/1170>