Documentation/comments for OpenAIService updated

Author: peterbanda

openai-core/src/main/scala/io/cequence/openaiscala/service/OpenAIService.scala

@@ -14,9 +14,11 @@ import scala.concurrent.Future
  *
  *  - '''Models''': listModels, and retrieveModel
  *  - '''Completions''': createCompletion
+ *  - '''Chat Completions''': createChatCompletion, and createChatFunCompletion
  *  - '''Edits''': createEdit
  *  - '''Images''': createImage, createImageEdit, createImageVariation
  *  - '''Embeddings''': createEmbeddings
+ *  - '''Audio''': createAudioTranscription, and createAudioTranslation
  *  - '''Files''': listFiles, uploadFile, deleteFile, retrieveFile, and retrieveFileContent
  *  - '''Fine-tunes''': createFineTune, listFineTunes, retrieveFineTune, cancelFineTune, listFineTuneEvents, and deleteFineTuneModel
  *  - '''Moderations''': createModeration