1.39.0: fix typos caught by Jonas.

Co-Authored-By: Jonas Schievink <jonasschievink@gmail.com>

Author: Centril

posts/2019-11-07-Rust-1.39.0.md

@@ -121,7 +121,7 @@ In the 1.35.0 release, [we announced][rel-1350] that NLL had come to Rust 2015 a
 
 As noted in the 1.35.0 release, the old borrow checker had some bugs which would allow memory unsafety. These bugs were fixed by the NLL borrow checker. As these fixes broke some stable code, we decided to gradually phase in the errors by checking if the old borrow checker would accept the program and the NLL checker would reject it. If so, the errors would instead become warnings.
 
-With Rust 1.39.0, these warnings are now [errors on Rust 2018][err-2018].
+With Rust 1.39.0, these warnings are now [errors in Rust 2018][err-2018].
 In the next release, Rust 1.40.0, [this will also apply to Rust 2015][err-2015], which will finally allow us to [remove the old borrow checker][rip-ast-borrowck], and keep the compiler clean.
 
 If you are affected, or want to hear more, read [Niko Matsakis's blog post][niko-blog-nll].
@@ -163,7 +163,7 @@ In Rust 1.39.0 the following functions were stabilized:
 
 There are other changes in the Rust 1.39.0 release: check out what changed in [Rust][notes], [Cargo][relnotes-cargo], and [Clippy][relnotes-clippy].
 
-Please also see the [compatability notes][compat-notes] to check if you're affected by those changes.
+Please also see the [compatibility notes][compat-notes] to check if you're affected by those changes.
 
 ## Contributors to 1.39.0