Javadoc 8 fixes.

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@1619420 13f79535-47bb-0310-9956-ffa450edef68
Checkstyle: remove trailing space.

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@1619423 13f79535-47bb-0310-9956-ffa450edef68