docs: fix server worker mode in railway deployment

[shahednasser]

Closes #9835

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[kasperkristensen]

@shahednasser quick question on this guide: Don't we need to update the guide to reflect the changes around standalone builds? Right now I don't believe you would be able to deploy to Railway following these instructions, because you need to run yarn start from the ./medusa/server folder.

I have put some context in this issue TRI-492 ✌️

[shahednasser]

@kasperkristensen thanks for letting me know! Will have to look into it I wasn't aware it would impact deployments. Let me check and look into what needs to be updated

[shahednasser]

@olivermrbl can we get this one in?