fix typo: 'git filter-repo' -> 'git-filter-repo'

[KorayUlusan]

Presumably a typo.

git doesn't have a filter-repo option. However git-filter-repo is a program (as linked in the docs).

Why:

explained.

What's being changed (if available, include any code snippets, screenshots, or gifs):

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Content directory changes

You may find it useful to copy this table into the pull request summary. There you can edit it to share links to important articles or changes and to give a high-level overview of how the changes in your pull request support the overall goals of the pull request.

Source	Preview	Production	What Changed
get-started/using-git/splitting-a-subfolder-out-into-a-new-repository.md	fpt ghec ghes@ 3.7 3.6 3.5 3.4 3.3 ghae	fpt ghec ghes@ 3.7 3.6 3.5 3.4 3.3 ghae

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fpt: Free, Pro, Team
ghec: GitHub Enterprise Cloud
ghes: GitHub Enterprise Server
ghae: GitHub AE

[cmwilson21]

@KorayUlusan Thanks so much for opening a PR! I'll get this triaged for review ⚡

[isaacmbrown]

Hi @KorayUlusan, thanks for taking the time to contribute!

While you're right that git filter-repo isn't a native Git command, it seems to be the correct syntax per the git-filter-repo README: https://github.com/newren/git-filter-repo#solving-this-with-filter-repo, and will presumably work once you have git-filter-repo installed 🙂

But on second thought, rather than closing this PR, let's try and clarify that here.

[isaacmbrown]

Applied a suggestion to clear up the confusion

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