the "docker swarm leave" command description mentioned that the command can only be used for workers, however, the command can also be used for managers (using the `-f` / `--force` option). this patch removes the "(workers only)" part of the command description. Signed-off-by: Sebastiaan van Stijn <github@gone.nl> Upstream-commit: f89eee5d9d3c01bc6d498fcb1163ec199e6c3078 Component: engine