Add a comment about the logic in gethostbyname

Author: eregon

lib/truffle/socket/socket.rb

@@ -138,7 +138,7 @@ def self.gethostbyname(hostname)
     addrinfos.each do |a|
       sockaddr = Socket.sockaddr_in(0, a[3])
 
-
+      # Done manually because we want to read the full address as a String, even if it contains nul bytes
       if a[4] == AF_INET
         offset = Truffle::Config['platform.sockaddr_in.sin_addr.offset']
         size = Truffle::Config['platform.sockaddr_in.sin_addr.size']