Fix/typo in build open ai chat app

[A-Programmer]

Summary

In the article at the create the app section step 3, there were wrong add package commands:

dotnet package add OpenAI
dotnet package add Microsoft.Extensions.AI.OpenAI
dotnet package add Microsoft.Extensions.Configuration
dotnet package add Microsoft.Extensions.Configuration.UserSecrets

Correct code:

dotnet add package OpenAI
dotnet add package  Microsoft.Extensions.AI.OpenAI
dotnet add package Microsoft.Extensions.Configuration
dotnet add package Microsoft.Extensions.Configuration.UserSecrets

Fixes #45635

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Internal previews

📄 File	🔗 Preview link
docs/ai/quickstarts/build-chat-app.md	CustomerIntent: As a .NET developer new to AI, I want deploy and use sample code to interact to learn from the sample code.

[A-Programmer]

Contributor

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