stop_signal supported with docker stack deploy

support was added nearly two years ago,
c.f. docker/cli#370

compose/compose-file/index.md

@@ -857,7 +857,6 @@ The following sub-options (supported for `docker-compose up` and `docker-compose
 - [network_mode](#network_mode)
 - [restart](#restart)
 - [security_opt](#security_opt)
-- [stop_signal](#stop_signal)
 - [sysctls](#sysctls)
 - [userns_mode](#userns_mode)
 
@@ -1616,10 +1615,6 @@ SIGTERM. Setting an alternative signal using `stop_signal` causes
 
     stop_signal: SIGUSR1
 
-> **Note**: This option is ignored when
-> [deploying a stack in swarm mode](/engine/reference/commandline/stack_deploy.md)
-> with a (version 3) Compose file.
-
 ### sysctls
 
 Kernel parameters to set in the container. You can use either an array or a