Fix help and README.md for notify-sighup

Author: dmitrygusev

README.md

@@ -95,7 +95,7 @@ Options:
       run command after template is regenerated (e.g restart xyz)
   -notify-output
       log the output(stdout/stderr) of notify command
-  -notify-sighup docker kill -s HUP container-ID
+  -notify-sighup container-ID
       send HUP signal to container.  Equivalent to docker kill -s HUP container-ID
   -only-exposed
       only include containers with exposed ports

cmd/docker-gen/main.go

@@ -96,7 +96,7 @@ func initFlags() {
 	flag.BoolVar(&notifyOutput, "notify-output", false, "log the output(stdout/stderr) of notify command")
 	flag.StringVar(&notifyCmd, "notify", "", "run command after template is regenerated (e.g `restart xyz`)")
 	flag.StringVar(&notifySigHUPContainerID, "notify-sighup", "",
-		"send HUP signal to container.  Equivalent to `docker kill -s HUP container-ID`")
+		"send HUP signal to container.  Equivalent to docker kill -s HUP `container-ID`")
 	flag.Var(&configFiles, "config", "config files with template directives. Config files will be merged if this option is specified multiple times.")
 	flag.IntVar(&interval, "interval", 0, "notify command interval (secs)")
 	flag.BoolVar(&keepBlankLines, "keep-blank-lines", false, "keep blank lines in the output file")