docs: add java docs

Author: surajkumar

application/src/main/java/org/togetherjava/tjbot/features/chatgpt/ChatGptModel.java

@@ -31,6 +31,9 @@ public enum ChatGptModel {
         this.chatModel = chatModel;
     }
 
+    /**
+     * @return the underlying OpenAI model used by this enum.
+     */
     public ChatModel toChatModel() {
         return chatModel;
     }

application/src/main/java/org/togetherjava/tjbot/features/help/HelpSystemHelper.java

@@ -181,7 +181,8 @@ RestAction<Message> constructChatGptAttempt(ThreadChannel threadChannel,
      *
      * @param answer The response text generated by AI.
      * @param selfUser The SelfUser representing the bot.
-     * @param title The title for the MessageEmbed.
+     * @param title The title for the MessageEmbed
+     * @param model The AI model that was used for the foot notes
      * @return A MessageEmbed that contains response generated by AI.
      */
     public MessageEmbed generateGptResponseEmbed(String answer, SelfUser selfUser, String title,