Javadoc 8 fixes: Use {@code foo} instead of <code>foo</foo>.

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@1619429 13f79535-47bb-0310-9956-ffa450edef68
Javadoc 8 fixes: Use {@code foo} instead of <code>foo</foo>. Fix a previous bad commit.

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@1619433 13f79535-47bb-0310-9956-ffa450edef68