Fixed typo for new git url.

[patcon]

Sorry, there was too much issue boilerplate for such a small fix, so I didn't read any of it. Thanks for understanding -- pls close if you can't merge 🙏

[welcome]

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[github-actions]

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Source	Preview	Production	What Changed
get-started/using-git/splitting-a-subfolder-out-into-a-new-repository.md	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10

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Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server
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