Fix Typographical Errors in Documentation

[Pricstas]

This pull request addresses minor typographical errors in the project documentation to improve clarity and accuracy.

Files Updated

1. README.md

   • Corrected the indefinite article usage: Changed "an (zk)-Ethereum Virtual Machine" to "a (zk)-Ethereum Virtual Machine" for grammatical accuracy.

2. CONTRIBUTING.md

   • Fixed the compound adjective formatting: Replaced "above mentioned" with "above-mentioned" to match standard English usage.

Time Spent

Approximately 15 minutes.

Pull Request Type

• Documentation content changes

Current Behavior

• Minor grammatical and typographical errors in project documentation.

New Behavior

• Documentation has been corrected for improved readability and professionalism.

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Checklist

• Self-reviewed changes for accuracy.
• Changes align with the project's contributing guidelines.
• No functional code changes were introduced.

This PR ensures the documentation adheres to proper grammatical standards, making it more user-friendly for developers and contributors.