Javadoc fixes.

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@1612086 13f79535-47bb-0310-9956-ffa450edef68
HTTPCLIENT-1531: CONNECT via proxy fails if authentication is disabled

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@1612816 13f79535-47bb-0310-9956-ffa450edef68