Merge pull request #126 from msizanoen/patch-1

Update enums.md

Author: RalfJung

reference/src/layout/enums.md

@@ -60,7 +60,7 @@ enum Foo {
 
 ## repr annotations accepted on enums
 
-In general, enums may be annotation using the following `#[repr]` tags:
+In general, enums may be annotated using the following `#[repr]` tags:
 
 - A specific integer type (called `Int` as a shorthand below):
   - `#[repr(u8)]`