dockerd.md: add --bridge-accept-fwmark

Related to cf1695bef1

Signed-off-by: Rob Murray <rob.murray@docker.com>

docs/reference/dockerd.md

@@ -29,6 +29,7 @@ Options:
       --bip string                            IPv4 address for the default bridge
       --bip6 string                           IPv6 address for the default bridge
   -b, --bridge string                         Attach containers to a network bridge
+      --bridge-accept-fwmark string           In bridge networks, accept packets with this firewall mark/mask
       --cdi-spec-dir list                     CDI specification directories to use
       --cgroup-parent string                  Set parent cgroup for all containers
       --config-file string                    Daemon configuration file (default "/etc/docker/daemon.json")
@@ -1070,6 +1071,7 @@ The following is a full example of the allowed configuration options on Linux:
   "bip": "",
   "bip6": "",
   "bridge": "",
+  "bridge-accept-fwmark": "",
   "builder": {
     "gc": {
       "enabled": true,