Made clear DNS subsystem is used (#653)

Documentation was confusing because is worded as if it queried using the DNS protocol, not the subsystem. If it was just using the DNS protocol, it could be bypassing the hosts file, similar to the nslookup tool. Confirmed this code does not bypass the hosts file.

Author: samrueby

xml/System.Net/Dns.xml

@@ -680,7 +680,7 @@
           <format type="text/markdown"><![CDATA[  
   
 ## Remarks  
- The <xref:System.Net.Dns.GetHostAddresses%2A> method queries a DNS server for the IP addresses associated with a host name. If `hostNameOrAddress` is an IP address, this address is returned without querying the DNS server.  
+ The <xref:System.Net.Dns.GetHostAddresses%2A> method queries the DNS subsystem for the IP addresses associated with a host name. If `hostNameOrAddress` is an IP address, this address is returned without querying the DNS server.
   
  If an empty string is passed as the `hostNameOrAddress` argument, then this method returns the IPv4 and IPv6 addresses of the local host.
   
@@ -1400,4 +1400,4 @@
       </Docs>
     </Member>
   </Members>
-</Type>
+</Type>