fix code

Author: alexwolfmsft

docs/ai/quickstarts/quickstart-openai-summarize-text.md

@@ -95,17 +95,17 @@ The following code obtains an `IChatClient` service configured to connect to the
 ```csharp
 // Create the IChatClient
 IChatClient client =
-    new OpenAIClient(new Uri(endpoint), new ApiKeyCredential(key))
-        .AsChatClient(deployment);
+    new OpenAIClient(key)
+        .AsChatClient(model);
 ```
 
 # [Azure OpenAI](#tab/azure-openai)
 
 ```csharp
 // Create the IChatClient
 IChatClient client =
-    new OpenAIClient(key)
-        .AsChatClient(model);
+    new AzureOpenAIClient(new Uri(endpoint), new ApiKeyCredential(key))
+        .AsChatClient(deployment);
 ```
 
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