DOC: configuration: update the crt-list documentation

Update the crt-list documentation with the supported keywords.

Also format it in a more clear way.

Must be backported to 2.8.

(cherry picked from commit e732de7db2da814a9b48c7664cd7785f031c429f)
Signed-off-by: Amaury Denoyelle <adenoyelle@haproxy.com>
(cherry picked from commit 4e18155fc02ffd877e98fdc96c324232d5405bee)
Signed-off-by: Amaury Denoyelle <adenoyelle@haproxy.com>
2 files changed