DOC: remove the comment saying that SSL certs are not checked on the server side

Server certificate check was added in 1.5-dev13 but the comment on the "ssl"
keyword was not removed, leading to confusion about when to use it.
BUG/MINOR: deinit: free fdinfo while doing cleanup

Both fdinfo and fdtab are allocated memory in init() while haproxy is starting,
but only fdtab is freed in deinit(), fdinfo should also be freed.

Signed-off-by: Godbach <nylzhaowei@gmail.com>
BUG: counters: third counter was not stored if others unset

Commit e25c917a introduced a third tracking counter bug forgot
to check it when storing values at the end of the session. The
impact is that  if neither the first nor the second one are
changed, none of them are saved.
DOC: minor typo fix in documentation

"http-reqsponse" => "http-response"

Signed-off-by: Godbach <nylzhaowei@gmail.com>