Grammatical changes to contributingmd file

[amitkumar-y]

While going through the Contributing.md file, I noticed a few grammatical errors, so I ran it through Grammarly and corrected the grammatical errors based on the suggestions.

Type of change

Just put an x in the [] which are valid.

• [x] Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes.

• [x ] `app.grammarly.com

Checklist:

• [x] My code follows the style guidelines of this project
• [x ] I have performed a self-review of my own code
• [x ] I have commented my code, particularly in hard-to-understand areas
• [x ] I have made corresponding changes to the documentation
• [x ] My changes generate no new warnings

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[amitkumar-y]

Hi @Swati4star , Could you please check this PR?