Fix typos in contributing.md

[sankalp-b1401]

Corrected typos and improved clarity in contributing guidelines.

Change(s)

Change Type: Fixed typos in contributing.md

Change Category: Documentation

Changelog Entry:
Corrected multiple typos in the contributing.md file.

How to Test

Checklist

• Tests have been added or updated to reflect the changes, or their absence is explicitly explained.
• Documentation has been added or updated to reflect the changes, or their absence is explicitly explained.
• A self-review has been conducted checking:
  • No unintended changes have been committed.
  • The changes in isolation seem reasonable.
  • Anything that may be odd or unintuitive is provided with a GitHub comment explaining it (but consider if this should not be a code comment or in the documentation instead).
• All CI checks pass before pinging a reviewer, or provide an explanation if they do not.
• The PR title matches the changelog entry's one-line description.

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