README - formatting a new code example + changing the model used to gpt_3_5_turbo (reads better)

Author: peterbanda

README.md

@@ -174,19 +174,22 @@ Examples:
 
 ```scala
   val createChatCompletionSettings = CreateChatCompletionSettings(
-    model = ModelId.gpt_3_5_turbo_0301
+    model = ModelId.gpt_3_5_turbo
   )
 
   val messages: Seq[MessageSpec] = Seq(
     MessageSpec(role = ChatRole.System, content = "You are a helpful assistant."),
     MessageSpec(role = ChatRole.User, content = "Who won the world series in 2020?"),
     MessageSpec(role = ChatRole.Assistant, content = "The Los Angeles Dodgers won the World Series in 2020."),
     MessageSpec(role = ChatRole.User, content = "Where was it played"),
-)
+  )
 
-  service.createChatCompletion(messages = messages, settings = createChatCompletionSettings).map { chatCompletion =>
-  println(chatCompletion.choices.head.message.content)
-}
+  service.createChatCompletion(
+    messages = messages,
+    settings = createChatCompletionSettings
+  ).map { chatCompletion =>
+    println(chatCompletion.choices.head.message.content)
+  }
 ```
 
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