Update documentation for SerializationSurrogateProvider property (#3748)

* Update documentation for SerializationSurrogateProvider property

* Update xml/System.ServiceModel.Description/DataContractSerializerOperationBehavior.xml

Co-Authored-By: Carlos Sanchez Lopez <1175054+carlossanlop@users.noreply.github.com>

* feedback

Co-authored-by: Carlos Sanchez Lopez <1175054+carlossanlop@users.noreply.github.com>
Co-authored-by: Maira Wenzel <mairaw@microsoft.com>

xml/System.ServiceModel.Description/DataContractSerializerOperationBehavior.xml

@@ -54,6 +54,7 @@
  ]]></format>
     </remarks>
     <altmember cref="T:System.Runtime.Serialization.IDataContractSurrogate" />
+    <altmember cref="T:System.Runtime.Serialization.ISerializationSurrogateProvider" />
     <altmember cref="T:System.Runtime.Serialization.DataContractSerializer" />
     <related type="Article" href="https://msdn.microsoft.com/library/8c31134c-46c5-4ed7-94af-bab0ac0dfce5">Data Contract Surrogates</related>
     <related type="Article" href="~/docs/framework/wcf/feature-details/using-data-contracts.md">Using Data Contracts</related>
@@ -471,8 +472,8 @@
         <ReturnType>System.Runtime.Serialization.ISerializationSurrogateProvider</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
-        <value>To be added.</value>
+        <summary>Gets or sets a surrogate provider to be used during the serialization and deserialization processes.</summary>
+        <value>A surrogate provider that is used to provide a serialization surrogate to be used during serialization and deserialization.</value>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>