Merge pull request #1971 from davidsh/EnsureSuccessStatusCode_30

Update HttpResponseMessage.EnsureSuccessStatusCode method

Author: davidsh

xml/System.Net.Http/HttpResponseMessage.xml

@@ -261,7 +261,7 @@
           <format type="text/markdown"><![CDATA[  
   
 ## Remarks  
- The <xref:System.Net.Http.HttpResponseMessage.EnsureSuccessStatusCode%2A> method throws an exception if the HTTP response was unsuccessful. If the <xref:System.Net.Http.HttpResponseMessage.Content%2A> is not `null`, this method will also call <xref:System.Net.Http.HttpResponseMessage.Dispose%2A> to free managed and unmanaged resources.  
+ The <xref:System.Net.Http.HttpResponseMessage.EnsureSuccessStatusCode%2A> method throws an exception if the HTTP response was unsuccessful. In .NET Framework and .NET Core 2.2 and earlier versions, if the <xref:System.Net.Http.HttpResponseMessage.Content%2A> is not `null`, this method will also call <xref:System.Net.Http.HttpResponseMessage.Dispose%2A> to free managed and unmanaged resources. Starting with .NET Core 3.0, the content will not be disposed. 
   
  ]]></format>
         </remarks>
@@ -482,4 +482,4 @@
       </Docs>
     </Member>
   </Members>
-</Type>
+</Type>