CLEANUP: code style: use tabs to indent codes

The original codes are indented by spaces and not aligned with the former line.
It should be a convention to indent by tabs in HAProxy.

Signed-off-by: Godbach <nylzhaowei@gmail.com>
DOC: checkcache: block responses with cacheable cookies

"requests" -> "responses"

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