DOC: config: fix rfc7239 converter examples (again)

Complementary fix to ac456ab ("DOC: config: fix rfc7239 converter examples")
since somehow I managed to overlook one example..

This needs to be backported in 2.8 with ac456ab.

(cherry picked from commit 1bdd490f9f05a41faeabb64533e404c749a78372)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
1 file changed