clarify --signal flag help

Signed-off-by: Alex Bozhenko <[email protected]>

Author: alexbozhenko

main.go

@@ -37,7 +37,13 @@ Server Options:
     -ms,--https_port <port>          Use port for https monitoring
     -c, --config <file>              Configuration file
     -t                               Test configuration and exit
-    -sl,--signal <signal>[=<pid>]    Send signal to nats-server process (ldm, stop, quit, term, reopen, reload)
+    -sl,--signal <command>[=<pid>]   Send a command to a running nats-server:
+                                       ldm - graceful shutdown (evicts clients gradually) (SIGUSR2)
+                                       quit - graceful shutdown (SIGINT)
+                                       term - graceful shutdown (SIGTERM)
+                                       stop - immediate termination (SIGKILL)
+                                       reload - reload configuration (SIGHUP)
+                                       reopen - reopen log files (SIGUSR1)
                                      <pid> can be either a PID (e.g. 1) or the path to a PID file (e.g. /var/run/nats-server.pid)
         --client_advertise <string>  Client URL to advertise to other servers
         --ports_file_dir <dir>       Creates a ports file in the specified directory (<executable_name>_<pid>.ports).