Merge pull request #254 from ruby/typofix

Fixed by `misspell -w -error -source=text`

Author: hsbt

lib/net/http.rb

@@ -1323,7 +1323,7 @@ def response_body_encoding=(value)
     # see {Proxy Server}[rdoc-ref:Net::HTTP@Proxy+Server].
     attr_writer :proxy_pass
 
-    # Sets wheter the proxy uses SSL;
+    # Sets whether the proxy uses SSL;
     # see {Proxy Server}[rdoc-ref:Net::HTTP@Proxy+Server].
     attr_writer :proxy_use_ssl