Adjusted some of the explanations of the FIN_WAIT_2 problems to

accurately reflect the current status, reasons why it occurs, and
what client authors should be doing.  Also reformatted my mail
message appendix so that it is applicable to a non-Apache audience.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@77533 13f79535-47bb-0310-9956-ffa450edef68