Net/http to_hash returns pair of key and values (where the values are arrays and not strings)

The comment on the method <code>Net::HTTPHeader#to_hash</code> states pair of key and values however it is should be pair of key and values, the values should be arrays and not strings (as in the comment), below is a sample to prove this.
```ruby
Net::HTTP.get_response(URI('http://www.google.com')).to_hash
=> {"date"=>["Thu, 05 Dec 2013 01:56:13 GMT"],
 "expires"=>["-1"],
 "cache-control"=>["private, max-age=0"],
 "content-type"=>["text/html; charset=ISO-8859-1"],
 "set-cookie"=>
  ["PREF=ID=d1e913f2336ed0f7:FF=0:TM=1386208573:LM=1386208573:S=VAKJNSsp0fqk2KJo; expires=Sat, 05-Dec-2015 01:56:13 GMT; path=/; domain=.google.com",
   "NID=67=n11-eGCvw3LfM3Uh9vPzB7mE5fC2B8QcLI01LoasujaIC3lm73DIFij78i40ibkMGx_FHxS6rC1MtlcJDnlLYbYbwecXI1PJM5qFE-D6-mOGgF69jvWws3QUzxtmKocO; expires=Fri, 06-Jun-2014 01:56:13 GMT; path=/; domain=.google.com; HttpOnly"],
 "p3p"=>
  ["CP=\"This is not a P3P policy! See http://www.google.com/support/accounts/bin/answer.py?hl=en&answer=151657 for more info.\""],
 "server"=>["gws"],
 "x-xss-protection"=>["1; mode=block"],
 "x-frame-options"=>["SAMEORIGIN"],
 "alternate-protocol"=>["80:quic"],
 "transfer-encoding"=>["chunked"]}
```