change the name from "Variable" to "Variadic"

en/02.3.md

@@ -257,9 +257,9 @@ The above example returns two values without names -you have the option of namin
     	return
 	}
 
-### Variable arguments
+### Variadic functions
 
-Go supports variable arguments, which means you can give an uncertain numbers of argument to functions. 
+Go supports functions with a variable number of arguments. These functions are called "variadic", which means the function allows an uncertain numbers of arguments. 
 
 	func myfunc(arg ...int) {}