Update collections.md

Author: corranrogue9

graph/articles/collections.md

@@ -350,7 +350,7 @@ The model can be updated to have two collections side-by-side:
   </Key>
   <Property Name="id" Type="Edm.String" Nullable="false" />
   <Property Name="bars" Type="Collection(self.bar)" />
-+ <Property Name="barsAsEntities" Type="Collection(self.barAsEntity)" />
++ <NavigationProperty Name="barsAsEntities" Type="Collection(self.barAsEntity)" ContainsTarget="true" />
 </EntityType>
 
 <ComplexType Name="bar">
@@ -410,6 +410,69 @@ TODO implement this in WebApi
 
 ### 11.2 `$select` overloading
 
+The model can be updated to simply switch the complex type for an entity type:
+```diff
+<EntityType Name="foo">
+  <Key>
+    <PropertyRef Name="id" />
+  </Key>
+  <Property Name="id" Type="Edm.String" Nullable="false" />
+- <Property Name="bars" Type="Collection(self.bar)" />
++ <NavigationProperty Name="bars" Type="Collection(self.bar)" ContainsTarget="true" />
+</EntityType>
+
+- <ComplexType Name="bar">
++ <EntityType Name="bar">
++ <Key>
++   <PropertyRef Name="prop1" />
++ </Key>
+  <Property Name="prop1" Type="Edm.String" />
+  <Property Name="prop2" Type="Edm.String" />
+-</ComplexType>
++</EntityType>
+```
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