Parameter trait "is ref" is now "is parcel"

S06-routines.pod

@@ -1923,7 +1923,7 @@ If you wish to allow the user to initialize an attribute by reference,
 you may either write your own initializer submethod explicitly, or
 simply mark the attributes you want to work that way with C<is ref>:
 
-    has $!age is ref;   # BUILD will automatically use ref binding, not copy
+    has $!age is parcel;   # BUILD will automatically use binding, not copy
 
 To rename an attribute parameter you can use the explicit pair form: