test more package description

feature_adapter.go

@@ -9,7 +9,6 @@
 // gives a description of how Marshall/Unmarshall operate
 // between arbitrary or predefined json objects and bytes,
 // and it applies to jsoniter.Marshall/Unmarshall.
-
 package jsoniter
 
 import (

feature_iter.go

@@ -4,7 +4,6 @@
 // and yielding parsed elements one by one.
 // This set of interfaces reads input as required and gives
 // better performance.
-
 package jsoniter
 
 import (