Javadoc fixes

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@1435315 13f79535-47bb-0310-9956-ffa450edef68
target cannot be null here otherwise the earlier invocation of target.getPort() would fail with NPE

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@1435320 13f79535-47bb-0310-9956-ffa450edef68