Typo in example

From Koichi via email (w25739@scsk.jp):

We found Typo in following page(this is same mistake…)
http://docs.couchbase.com/couchbase-sdk-net-1.3/#using-couchbaseclient-json-extension-methods
http://docs.couchbase.com/couchbase-sdk-net-1.2/#couchbaseclient-json-extension-methods

in sample code…

var savedBeer = client.GetJson<beer><Beer>(key);</beer>

should be

var savedBeer = client.GetJson<Beer>(key);