Merge pull request #4085 from andrew-d/andrew-fix-typo

Fix small typo in kinds documentation

Author: catamorphism

src/libcore/kinds.rs

@@ -1,7 +1,7 @@
 /*!
 The kind traits
 
-Rust types can be classified in vairous useful ways according to
+Rust types can be classified in various useful ways according to
 intrinsic properties of the type. These classifications, often called
 'kinds', are represented as traits.