Fix Grammatical Mistake In CONTRIBUTING.md

[mqasim41]

Description

Please include a summary of the change and which issue is fixed or implemented. Please also include relevant motivation and context (e.g. links, docs, tickets etc.).

List any dependencies that are required for this change.

Fixed a grammatical mistake in CONTRIBUTING.md to increase the quality of the document. No dependencies are required.

Type of change

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

How has this change been tested, please provide a testcase or example of how you tested the change?

No testing is required. Only some text was changed.

Any specific deployment considerations

For example, documentation changes, usability, usage/costs, secrets, etc.

None

Docs

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[CLAassistant]

All committers have signed the CLA.

[onuralpszr]

@mqasim41 thank you.

[SkalskiP]

thanks for merging that without me :)