remove duplicate text in heroku guide (phoenixframework#5609)

guides/deployment/heroku.md

@@ -176,17 +176,6 @@ config :hello, Hello.Repo,
   pool_size: String.to_integer(System.get_env("POOL_SIZE") || "10")
 ```
 
-
-
-Then open up your `config/runtime.exs` (formerly `config/prod.secret.exs`) and uncomment the `# ssl: true,` line in your repository configuration. It will look like this:
-
-```elixir
-config :hello, Hello.Repo,
-  ssl: true,
-  url: database_url,
-  pool_size: String.to_integer(System.get_env("POOL_SIZE") || "10")
-```
-
 Finally, if you plan on using websockets, then we will need to decrease the timeout for the websocket transport in `lib/hello_web/endpoint.ex`. If you do not plan on using websockets, then leaving it set to false is fine. You can find further explanation of the options available at the [documentation](https://hexdocs.pm/phoenix/Phoenix.Endpoint.html#socket/3-websocket-configuration).
 
 ```elixir