removed the command as below error (#3137)

sudo python install.py  --setup-production
usage: install.py [-h] [--develop | --production] [--site SITE] [--verbose]
                  [--user USER] [--bench-branch BENCH_BRANCH]
                  [--repo-url REPO_URL]
install.py: error: unrecognized arguments: --setup-production

frappe/docs/user/en/bench/guides/setup-production.md

@@ -1,8 +1,7 @@
 You can setup the bench for production use by configuring two programs, Supervisor and nginx. If you want to revert your Production Setup to Development Setup refer to [these commands](https://github.com/frappe/bench/wiki/Stopping-Production-and-starting-Development)
 
 ####Easy Production Setup
-These steps are automated if you pass `--setup-production` to the easy install script 
-or run `sudo bench setup production`
+These steps are automated if you run `sudo bench setup production`
 
 
 ####Manual Production Setup
@@ -53,4 +52,4 @@ Note: When you restart nginx after the configuration change, it might fail if
 you have another configuration with server block as default for port 80 (in most
 cases for the nginx welcome page). You will have to disable this config.  Most
 probable places for it to exist are `/etc/nginx/conf.d/default.conf` and
-`/etc/nginx/conf.d/default`.
+`/etc/nginx/conf.d/default`.