Updated Java API documentation reference

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@1626737 13f79535-47bb-0310-9956-ffa450edef68
Fixed javadoc warning

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@1626738 13f79535-47bb-0310-9956-ffa450edef68