Update CONTRIBUTING.md

[Archit-Kohli]

Title and Issue number

Title : Removed extra inverted comma from contributing.md

Issue No. : #285

Code Stack : Markdown

Close #285

Checklist:

• [x] I have mentioned the issue number in my Pull Request.
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have created a helpful and easy to understand README.md
• [x] I have updated the Index.html file for my contribution

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