Showing a deprecation warning when running the bundle install for deployment

[anoobbava]

Hi,
I was deploying a Ruby On Rails application, and follow the steps mentioned in the link

when it executed, it is showing the deprecation warning for the flag,

[DEPRECATED] The --withoutflag is deprecated because it relies on being remembered across bundler invocations, which bundler will no longer do in future versions. Instead please usebundle config set without 'development test', and stop using this flag

I was using Rails: 6.0.3 and Ruby: 2.7.0

I have added a PR to change the command in the deployment page,
#619