typo: duplicate index 'global_env'

[panboo0106]

Description

hello i'm new here, I found one typo. Maybe it's not wrong, please feel free

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Checklist

• [ x ] I've read the contributing guidelines and have adhered to them in this PR
• [ x ] I've updated the README and/or relevant docs pages
• [ x ] I've run make test to ensure all tests pass
• [ x ] I've run make format to format the code
• [ x ] I've run make docs to update the vimdoc pages

[ravitemer]

Thanks for the PR