Merge pull request #21 from mattes/patch-1

Fix trivial documentation typo. 
diff --git a/yaml.go b/yaml.go
index 903b13b..f1c390e 100644
--- a/yaml.go
+++ b/yaml.go
@@ -75,7 +75,7 @@
 //         F int `yaml:"a,omitempty"`
 //         B int
 //     }
-//     var T t
+//     var t T
 //     yaml.Unmarshal([]byte("a: 1\nb: 2"), &t)
 //
 // See the documentation of Marshal for the format of tags and a list of