Typo fixed

yaml.go

diff --git a/yaml.go b/yaml.go
index 44b0cc6..f4e03bf 100644
--- a/yaml.go
+++ b/yaml.go
@@ -78,7 +78,7 @@
 //         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