Remove remarks

Author: ManickaP

xml/System.Net.Http/WinHttpHandler.xml

@@ -318,13 +318,7 @@ When this property is set to `true`, all HTTP redirect responses from the server
       <Docs>
         <summary>When the default (system) proxy is used, gets or sets the credentials used to submit to the default proxy server for authentication.</summary>
         <value>The credentials used to authenticate the user to an authenticating proxy.</value>
-        <remarks>
-          <format type="text/markdown"><![CDATA[
-
-The default proxy is used only when <xref:System.Net.Http.WinHttpHandler.Proxy> is set to `null`.
-
-         ]]></format>
-        </remarks>
+        <remarks>To be added.</remarks>
       </Docs>
     </Member>
     <MemberGroup MemberName="Dispose">