DOC: quic: fix misspelled tune.quic.socket-owner

Commit 511ddd5 introduced tune.quic.socket-owner parameter related to
QUIC socket behaviour. However it was misspelled in configuration.txt in
'bind' section as tune.quic.conn-owner.

(cherry picked from commit a475448161b406b0b81f5b551336417b05426492)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
diff --git a/doc/configuration.txt b/doc/configuration.txt
index 4bc0e40..b2982e8 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -4936,7 +4936,7 @@
                       was the FD of an accept(). Should be used carefully.
                     - 'quic4@' -> address is resolved as IPv4 and protocol UDP
                       is used. Note that to achieve the best performance with a
-                      large traffic you should keep "tune.quic.conn-owner" on
+                      large traffic you should keep "tune.quic.socket-owner" on
                       connection. Else QUIC connections will be multiplexed
                       over the listener socket. Another alternative would be to
                       duplicate QUIC listener instances over several threads,