Docs: Change the github command to set the upstream in CONTRIBUTING.md

[KshitijDarekar]

Describe the bug
There is a minor change required in the GitHub command to set the upstream repository in the Contributing.md file.
The current command gives an error: " fatal: pathspec 'upstream' did not match any files "

Screenshots

Are you willing to contribute to this issue?
Yes

[AyushShri]

Hi @KshitijDarekar , First of all, thank you so much for taking out the time to create this issue #54

I looked through your issue and realized it's a command error.

Definitely:raised_hands:, Please go forward to work on this issue. I am assigning this Issue to you :thumbsup:

And last but not least,
Keep Contributing 🙏🔥

[KshitijDarekar]

@AyushShri I have made a PR #59 .

[kothariji]

Thank you for your contributions @KshitijDarekar 🚀

Keep Contributing 🙏 🔥