Improve intro to traits section

Nick Hamann · Nick Hamann · commit afe2c1fca810 · 2015-05-11T16:20:52.000-05:00
diff --git a/src/doc/reference.md b/src/doc/reference.md
@@ -1307,8 +1307,8 @@ type of the value is not required to ascribe to `Sync`.
 
 ### Traits
 
-A _trait_ describes a collection of methods and associated items (like
-associated types or associated constants).
+Traits are Rust's take on interfaces. A _trait_ describes a collection of
+methods and associated items (like associated types or associated constants).
 
 An example is the following trait `Shape`:
 
