DOC: quic: specify that connection migration is not supported

Currently haproxy does not support QUIC connection migration. This is
advertized to clients on their connections. Document this in the first
QUIC related paragraph.

This should be backported up to 2.6.

(cherry picked from commit 59b69aafae0db672509a7469cc59cc2e87cc0b32)
Signed-off-by: Amaury Denoyelle <adenoyelle@haproxy.com>
(cherry picked from commit 939f4176dc5c53f629af0890fe6e4eb0eeed0e90)
 [ad: context adjustment]
Signed-off-by: Amaury Denoyelle <adenoyelle@haproxy.com>
1 file changed