fix: gpt sample fix, class name fix

Author: srcnalt

Runtime/OpenAI.cs renamed to Runtime/OpenAIApi.cs

@@ -21,15 +21,15 @@ private void Start()
 
         private async void SendReply()
         {
+            userInput = inputField.text;
+            Instruction += $"{userInput}\nA: ";
+            
             textArea.text = "...";
             inputField.text = "";
 
             button.enabled = false;
             inputField.enabled = false;
 
-            userInput = inputField.text;
-            Instruction += $"{userInput}\nA: ";
-
             // Complete the instruction
             var completionResponse = await openai.CreateCompletion(new CreateCompletionRequest()
             {