docs(hermetic_build): fix config field name in readme

[zhumin8]

Fix config field name requires_billing listed in README.md.

[gemini-code-assist]

Summary of Changes

Hello, 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 addresses a minor documentation inaccuracy by updating a configuration field name in the README.md file. The change ensures that the documentation accurately reflects the correct field name, improving clarity and preventing potential confusion for users referencing the configuration.

Highlights

• Documentation Update: Corrected a misnamed configuration field, requires-billing to requires_billing, in the hermetic_build/README.md file.

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[gemini-code-assist]

Code Review

This pull request updates the documentation in hermetic_build/README.md to correct a configuration field name from requires-billing to requires_billing. This change aligns the documentation with the implementation in the codebase. The change is accurate and no issues were found.

_{Note: Security Review has been skipped due to the limited scope of the PR.}

[sonarqubecloud]

Quality Gate passed for 'gapic-generator-java-root'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[sonarqubecloud]

Quality Gate passed for 'java_showcase_integration_tests'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud