Add map to relationship and react to changes pages

source/sdk/cpp/model-data/relationships.txt

@@ -46,11 +46,11 @@ A **to-many** relationship means that an object relates to more than one
 other object. In Realm, a to-many relationship is a list of 
 references to other objects. For example, a person might have many dogs.
 
-You can represents a to-many relationship between two Realm
-types as a list or a set. Lists and sets are mutable: within a write 
-transaction, you can add and remove elements to and from a list or set. 
-Lists are not associated with a query and are declared as a property of 
-the object model.
+You can represent a to-many relationship between two Realm
+types as a list, map, or a set. Lists, maps, and sets are mutable: within 
+a write transaction, you can add and remove elements to and from these 
+collection types. Lists, maps, and sets are not associated with a query 
+and are declared as a property of the object model.
 
 .. _cpp-inverse-relationship:
 

source/sdk/cpp/react-to-changes.txt

@@ -65,7 +65,7 @@ Register a Collection Change Listener
 -------------------------------------
 
 You can register a notification handler on a collection. A collection is
-a list or set property that can contain any :ref:`supported data type 
+a list, map, or set property that can contain any :ref:`supported data type 
 <cpp-supported-property-types>`, including primitives or other objects.
 
 Realm notifies your handler whenever a write transaction