doc: clarify Cloud Billing quickstart description

[bbilbo]

I was reading through the Billing documentation and noticed that the landing page referred to the "Cloud Billing Budget API," while the code snippet actually demonstrates the general Cloud Billing service. I've updated the text to match the code snippet for better clarity.

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This change is 

[gemini-code-assist]

Summary of Changes

Hello @bbilbo, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request improves the accuracy of the Cloud Billing quickstart documentation. The previous description incorrectly referred to the 'Cloud Billing Budget API,' while the associated code snippet showcased the broader Cloud Billing service. The change ensures that the documentation text now correctly aligns with the demonstrated code, enhancing clarity for users.

Highlights

• Documentation Clarity: The description for the Cloud Billing quickstart documentation has been updated to accurately reflect that the code snippet demonstrates the general Cloud Billing service, rather than specifically the Cloud Billing Budget API.

Changelog

• google/cloud/billing/doc/main.dox
  • Updated the quickstart description to remove the specific mention of 'Budget API' and refer to the general 'Cloud Billing C++ client library'.

Activity

• No specific activity has been recorded for this pull request yet.

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[gemini-code-assist]

Code Review

This pull request correctly updates the quickstart documentation to refer to the general Cloud Billing service instead of the more specific Budget API. This improves clarity. I have one minor suggestion to ensure consistent naming with the rest of the document.

[gemini-code-assist]

For consistency with the main page title (@mainpage Cloud Billing API C++ Client Library) and the link on line 6, consider using the full name 'Cloud Billing API' here.

which should give you a taste of the Cloud Billing API C++ client library.