Javadoc fixes

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk@1616429 13f79535-47bb-0310-9956-ffa450edef68
Code optimizations and cleanups per Sebb's comments

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk@1616430 13f79535-47bb-0310-9956-ffa450edef68