Suggest update some script in 'CONTRIBUTING.md'

[iammiori]

Describe the problem

3. Create a new branch from master with a meaningful name for a new feature or an issue you want to work on:

   git checkout -b your-meaningful-branch-name
   

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The git switch command was introduced in version Git 2.23, and is designed to make branch switching more clear and secure.
reference : https://git-scm.com/docs/git-switch

so I recommend this,

git switch -c your-meaningful-branch-name

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Additional context

Of course, we can use checkout.