Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=56416
Document correct default for socket linger.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1589726 13f79535-47bb-0310-9956-ffa450edef68
Minor optimisation

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1589737 13f79535-47bb-0310-9956-ffa450edef68
Fix text

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1589738 13f79535-47bb-0310-9956-ffa450edef68