docs: fix deprecated Buffer constructor and formatting issues in README - #7371

This pull request makes minor improvements to the README.md documentation. The changes update examples to use modern Node.js APIs and correct a small formatting issue.

• Node.js API modernization:

  • Replaced usage of new Buffer() with Buffer.alloc() in code examples to follow current Node.js best practices and avoid deprecated APIs. [1] [2]

• Documentation formatting:

  • Fixed a typo by adding a missing space after a comma in the URLSearchParams section for improved readability.

Summary by cubic

Modernize README examples by replacing deprecated new Buffer() with Buffer.alloc() and fix a small URLSearchParams formatting issue. This improves clarity and aligns docs with current Node.js practices.

Description

• Changes: replace new Buffer() with Buffer.alloc() in two examples; fix spacing/link formatting in the URLSearchParams paragraph.
• Reason: avoid deprecated APIs and improve readability.
• Context: docs-only; no runtime or API changes.

Testing

• No tests added or modified; not needed for a docs-only update.
• Example snippets remain valid in supported Node versions.

^{Written for commit 7bf9887. Summary will update on new commits.}