Add missing step.

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpasyncclient/trunk@1481312 13f79535-47bb-0310-9956-ffa450edef68
Fix typos.

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpasyncclient/trunk@1481313 13f79535-47bb-0310-9956-ffa450edef68
For the step that uses Clover, re-iterate that you must use Maven 2.

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpasyncclient/trunk@1481314 13f79535-47bb-0310-9956-ffa450edef68