Fix docs about ssl protocols default

Author: ManickaP

xml/System.Net.Http/WinHttpHandler.xml

@@ -825,7 +825,7 @@ The default proxy is used only when <xref:System.Net.Http.WinHttpHandler.Proxy>
           <format type="text/markdown"><![CDATA[
 
 ## Remarks
- The default value is `SslProtocols.Tls | SslProtocols.Tls11 | SslProtocols.Tls12`.
+ The default value is `None`, which is the recommended value. It allows the operating system to choose the best protocol to use, and to block protocols that are not secure. For more information, see <xref:System.Net.Security.SslProtocols>.
 
  ]]></format>
         </remarks>