Configure direct-delivery incoming email for self-hosted sites with Mail-Receiver

Documentation Self-Hosting
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Can you explain how? The presence/absence of quotes around this value yields no difference:

[2] pry(main)> YAML::load("env:\n  DISCOURSE_BASE_URL: 'https://discourse.example.com'")
=> {"env"=>{"DISCOURSE_BASE_URL"=>"https://discourse.example.com"}}

[3] pry(main)> YAML::load("env:\n  DISCOURSE_BASE_URL: https://discourse.example.com")
=> {"env"=>{"DISCOURSE_BASE_URL"=>"https://discourse.example.com"}}