Correct typo (#3971)

The following line:

> various HTTP message HANDLES that can be used.

Should read:

> various HTTP message HANDLERS that can be used.

Author: gewarren

xml/ns-System.Net.Http.xml

@@ -21,7 +21,7 @@
   
 4.  <xref:System.Net.Http.HttpClientHandler> - HTTP handlers responsible for producing HTTP response messages.  
   
- There are various HTTP message handles that can be used. These include the following.  
+ There are various HTTP message handlers that can be used. These include the following.  
   
 1.  <xref:System.Net.Http.DelegatingHandler> - A class used to plug a handler into a handler chain.  
   
@@ -57,4 +57,4 @@
     <related type="ExternalDocumentation" href="https://go.microsoft.com/fwlink/?LinkID=245696">Connecting to a web service</related>
     <related type="ExternalDocumentation" href="https://go.microsoft.com/fwlink/?LinkId=242550">HttpClient Sample</related>
   </Docs>
-</Namespace>
+</Namespace>