DOC: config: specify supported sections for "max-session-srv-conns"

There was no info about supported sections for "max-session-srv-conns"
proxy directive. A quick look at the code tells us that it may be used
in proxies with the FE capability set.

(cherry picked from commit 4039329954807769495fafd3c6c85e4407ba3a35)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
1 file changed