Add a basic cursor vs iterator paragraph

proposals/p1885.md

@@ -84,6 +84,12 @@ The original `for` proposal does not define a way for user-defined types to
 opt-in to support range-based for loops. An approach is proposed in this
 document.
 
+This can be achieved using either a cursor or an iterator. A cursor benefits
+from being simple to manipulate and understand, and is used against a container.
+On the other hand, an iterators benefits from being more self-contained
+(dereferencing, next item, and optionally boundary), at the expense of its
+complexity.
+
 ### Other languages
 
 This section highlights some examples of how iterators and range-based for