Fix references to gobson in the documentation.

goyaml.go

diff --git a/goyaml.go b/goyaml.go
index 59357cc..fc1219c 100644
--- a/goyaml.go
+++ b/goyaml.go
@@ -33,7 +33,7 @@
 
 // Objects implementing the goyaml.Setter interface will receive the YAML
 // tag and value via the SetYAML method during unmarshaling, rather than
-// being implicitly assigned by the gobson machinery.  If setting the value
+// being implicitly assigned by the goyaml machinery.  If setting the value
 // works, the method should return true.  If it returns false, the given
 // value will be omitted from maps and slices.
 type Setter interface {
@@ -41,7 +41,7 @@
 }
 
 // Objects implementing the goyaml.Getter interface will get the GetYAML()
-// method called when gobson is requested to marshal the given value, and
+// method called when goyaml is requested to marshal the given value, and
 // the result of this method will be marshaled in place of the actual object.
 type Getter interface {
     GetYAML() (tag string, value interface{})