add ayu shout-out

Author: steveklabnik

posts/2020-10-05-Rust-1.47.md

@@ -128,7 +128,9 @@ on Windows. Other platforms ignore this flag.
 
 ### Library changes
 
-Nine new APIs were stabilized this release:
+[Rustdoc has gained support for the Ayu theme](https://github.com/rust-lang/rust/pull/71237/).
+
+Additionally, nine new APIs were stabilized this release:
 
 - [`Ident::new_raw`]
 - [`Range::is_empty`]
@@ -140,7 +142,7 @@ Nine new APIs were stabilized this release:
 - [`f32::TAU`]
 - [`f64::TAU`]
 
-Additonally, the following previously stable APIs have now been made `const`:
+The following previously stable APIs have now been made `const`:
 
 - [The `new` method for all `NonZero` integers.][73858]
 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,