add note about untrusted data (dotnet#8717)

Author: gewarren

xml/System.Resources/ResXDataNode.xml

@@ -33,14 +33,15 @@
     <remarks>
       <format type="text/markdown"><![CDATA[  
   
-## Remarks  
+## Remarks
+
+[!INCLUDE [untrusted-data-class-note](~/includes/untrusted-data-class-note.md)]
+
  The <xref:System.Resources.ResXDataNode> class supports the representation of rich data types within a resource file. It can support the storage of any object in a resource file, so long as the object supports serialization and type editors.  
   
  You can create a <xref:System.Resources.ResXDataNode> object by calling one of its overloaded class constructors. You can then add the resource item or element to a resource file by calling the <xref:System.Resources.ResXResourceWriter.AddResource%2A?displayProperty=nameWithType> method.  
   
- To retrieve an existing <xref:System.Resources.ResXDataNode> object, you must enumerate the <xref:System.Resources.ResXDataNode> objects in an XML resource file by instantiating a <xref:System.Resources.ResXResourceReader> object, setting the <xref:System.Resources.ResXResourceReader.UseResXDataNodes%2A?displayProperty=nameWithType> property to `true`, and calling the <xref:System.Resources.ResXResourceReader.GetEnumerator%2A?displayProperty=nameWithType> method to get an enumerator. The example provides an illustration.  
-  
-   
+ To retrieve an existing <xref:System.Resources.ResXDataNode> object, you must enumerate the <xref:System.Resources.ResXDataNode> objects in an XML resource file by instantiating a <xref:System.Resources.ResXResourceReader> object, setting the <xref:System.Resources.ResXResourceReader.UseResXDataNodes%2A?displayProperty=nameWithType> property to `true`, and calling the <xref:System.Resources.ResXResourceReader.GetEnumerator%2A?displayProperty=nameWithType> method to get an enumerator. The example provides an illustration.
   
 ## Examples  
  The following example uses the <xref:System.Resources.ResXResourceReader.GetEnumerator%2A?displayProperty=nameWithType> method to obtain an <xref:System.Collections.IDictionaryEnumerator> object that is used to enumerate the <xref:System.Resources.ResXDataNode> objects in a .resx file. The example includes a `CreateResourceFile` routine that creates the necessary XML resource file.  
@@ -52,7 +53,7 @@
   
  ]]></format>
     </remarks>
-    <related type="Article" href="https://msdn.microsoft.com/library/f7570c09-7db5-44f2-983a-e8859caeb0d5">Serialization in the .NET Framework</related>
+    <related type="Article" href="/dotnet/standard/serialization/">Serialization in .NET</related>
   </Docs>
   <Members>
     <MemberGroup MemberName=".ctor">

xml/System.Resources/ResXResourceReader.xml

@@ -36,7 +36,10 @@
     <remarks>
       <format type="text/markdown"><![CDATA[  
   
-## Remarks  
+## Remarks
+
+[!INCLUDE [untrusted-data-class-note](~/includes/untrusted-data-class-note.md)]
+
  The <xref:System.Resources.ResXResourceReader> class provides a default implementation of the <xref:System.Resources.IResourceReader> interface that reads resource information in an XML format. To read resource information from a binary resource format, use the <xref:System.Resources.ResourceReader> class.  
   
  You use the <xref:System.Resources.ResXResourceReader> class to enumerate resources in .resx files by traversing the dictionary enumerator (<xref:System.Collections.IDictionaryEnumerator>) that is returned by the <xref:System.Resources.ResXResourceReader.GetEnumerator%2A> method. You call the methods provided by <xref:System.Collections.IDictionaryEnumerator> to advance to the next resource and to read the name and value of each resource in the .resx file.  

xml/System.Resources/ResXResourceSet.xml

@@ -23,7 +23,10 @@
     <remarks>
       <format type="text/markdown"><![CDATA[  
   
-## Remarks  
+## Remarks
+
+[!INCLUDE [untrusted-data-class-note](~/includes/untrusted-data-class-note.md)]
+
  The <xref:System.Resources.ResXResourceSet> class enumerates over an <xref:System.Resources.IResourceReader>, loads every name and value, and stores them in a hash table. You can then enumerate the resources in the <xref:System.Resources.ResXResourceSet> object or retrieve individual resources by name.
   
  A <xref:System.Resources.ResXResourceSet> object provides a convenient way to read all the resources in a .resx file into memory. You can use the <xref:System.Resources.ResourceSet.GetObject%2A> method to retrieve a particular resource when the .resx file has been read into a <xref:System.Resources.ResXResourceSet> instance.