fix-up typo unkown->unknown
@@ -252,7 +252,7 @@ func TestSDConfigUnmarshalYAML(t *testing.T) {
expectErr: true,
},
{
- name: "invalid unkown dns type",
+ name: "invalid unknown dns type",
input: SDConfig{
Names: []string{"a.example.com", "b.example.com"},
Type: "PTR",
