[Docs Bug 🐞 report]: change in git-workflow.md

[nikhilkalburgi]

Describe the bug you found in AsyncAPI Docs.

git-workflow.md: Run the git fetch upstream master command does not fetch all the branches.

Attach any resources that can help us understand the issue.

https://github.com/asyncapi/community/blob/master/git-workflow.md step 3 under Working on a Fork on local

Code of Conduct

• I agree to follow this project's Code of Conduct

[github-actions]

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