Fix/typo in build open ai chat app (#45636)

Author: A-Programmer

docs/ai/quickstarts/build-chat-app.md

@@ -54,22 +54,22 @@ Complete the following steps to create a .NET console app to connect to an AI mo
     :::zone target="docs" pivot="azure-openai"
 
     ```bash
-    dotnet package add Azure.Identity
-    dotnet package add Azure.AI.OpenAI
-    dotnet package add Microsoft.Extensions.AI.OpenAI
-    dotnet package add Microsoft.Extensions.Configuration
-    dotnet package add Microsoft.Extensions.Configuration.UserSecrets
+    dotnet add package Azure.Identity
+    dotnet add package Azure.AI.OpenAI
+    dotnet add package Microsoft.Extensions.AI.OpenAI
+    dotnet add package Microsoft.Extensions.Configuration
+    dotnet add package Microsoft.Extensions.Configuration.UserSecrets
     ```
 
     :::zone-end
 
     :::zone target="docs" pivot="openai"
 
     ```bash
-    dotnet package add OpenAI
-    dotnet package add Microsoft.Extensions.AI.OpenAI
-    dotnet package add Microsoft.Extensions.Configuration
-    dotnet package add Microsoft.Extensions.Configuration.UserSecrets
+    dotnet add package OpenAI
+    dotnet add package Microsoft.Extensions.AI.OpenAI
+    dotnet add package Microsoft.Extensions.Configuration
+    dotnet add package Microsoft.Extensions.Configuration.UserSecrets
     ```
 
     :::zone-end