Docs: Typo on instantiating client

Just wanted to let you know that there is a typo in the C# documentation where it shows using Enyim.Caching.Memcached twice

Instantiating the Client¶ (http://docs.couchbase.com/couchbase-sdk-net-1.3/#instantiating-the-client)

To instantiate the client, add the following using statements to the Program.cs file:

using Couchbase;

using Enyim.Caching.Memcached;

using Enyim.Caching.Memcached;

using Newtonsoft.Json;