remove attributes temporarily again

Author: mairaw

xml/System.Net.Mail/SmtpClient.xml

@@ -29,11 +29,6 @@
       <InterfaceName>System.IDisposable</InterfaceName>
     </Interface>
   </Interfaces>
-  <Attributes>
-    <Attribute FrameworkAlternate="xamarinandroid-7.1;xamarinios-10.8;xamarinmac-3.0">
-      <AttributeName>System.Obsolete("SmtpClient and its network of types are poorly designed, we strongly recommend you use https://github.com/jstedfast/MailKit and https://github.com/jstedfast/MimeKit instead")</AttributeName>
-    </Attribute>
-  </Attributes>
   <Docs>
     <summary>Allows applications to send email by using the Simple Mail Transfer Protocol (SMTP). The <c>SmtpClient</c> type is now obsolete.</summary>
     <remarks>