Add instructions for viewing build-time OpenAPI logs

[mohaimenDev]

This change adds a section to the official documentation on how to view the GetDocument step logs using the .NET Terminal Logger.

Original PR: dotnet/aspnetcore#63251

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Internal previews

📄 File	🔗 Preview link
aspnetcore/fundamentals/openapi/aspnetcore-openapi.md	aspnetcore/fundamentals/openapi/aspnetcore-openapi

[guardrex]

Thanks, @mohaimenDev! If you agree with the terms, please sign the CLA ☝️ in order for us to accept this.

[mohaimenDev]

@dotnet-policy-service agree

[guardrex]

Thanks @mohaimenDev! We'll get a review/approval from @captainsafia next.

Safia ... a few side-notes .......

• The -tlp option (terminal logger provider) doesn't seem to be documented anywhere. If you know of a landing page that I can cross-link, I'm 👂 for it.
• Although dotnet build docs use "terminal logger" as a common noun, it's actually a proper noun (Terminal Logger) IMO (as submitted by @mohaimenDev), so it really should be capitalized. Let's do that here. I've opened an issue on the dotnet build article asking Andy to consider it making it a proper noun there.
• I think "GetDocument" in this context shouldn't be localized, so I'm preventing localization on the PR. Let me know if it should be translated (and probably with a space between "Get" and "Document"). 👂

... and sorry for all of the pings! 🙈 I think I finally have my act together here! 🤞🍀😄

[guardrex]

@captainsafia ... In passing, I see some little NITs 😈 in the article. I'll open an issue to address them separately and ping u for review later.