Improve Contributing Guidelines — Grammar, Formatting, and Clarity Updates

[vipul264og]

This PR refines the CONTRIBUTING.md file by correcting minor grammar, punctuation, and formatting issues. It also enhances readability and consistency across sections (e.g., VS Code references, test example phrasing, list structure).
No content was removed — only clarity, professionalism, and Markdown formatting were improved.

Changes include:

Fixed typos and minor grammar errors

Improved sentence flow and readability

Standardized capitalization and punctuation

Updated Markdown structure for better rendering on GitHub

Polished notes and callouts for visual consistency

[vercel]

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