Fix comparison to dmap

Author: dlesbre

README.md

@@ -306,7 +306,7 @@ However, its maps aren't Patricia trees. They are binary trees build using a
 Another difference is that the type of values in the map is independent of the type of the keys,
 allowing keys to be associated with different values in different maps. i.e.
 we map `'a key` to any `('a, 'b) value` type, whereas dmap only maps `'a key`
-to `'a`.
+to `'a` or `'a value`.
 
 `dmap` also works with OCaml `>= 4.12`, whereas we require OCaml `>= 4.14`.
 

index.mld

@@ -304,7 +304,7 @@ However, its maps aren't Patricia trees. They are binary trees build using a
 Another difference is that the type of values in the map is independent from the
 type of the keys, allowing keys to be associated with different values in different maps.
 i.e. we map ['a key] to any [('a, 'b) value] type, whereas dmap only maps ['a key]
-to ['a].
+to ['a] or ['a value].
 
 [dmap] also works with OCaml [>= 4.12], whereas we require OCaml [>= 4.14].