Remove .git from directory name

[viliusddd]

By default, git clone creates a directory with the same name as the repository, but it does not append .git to the directory name.

Why:

By default, git clone creates a directory with the same name as the repository, but it does not append .git to the directory name.
Closes:

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

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The table contains an overview of files in the content directory that have been changed in this pull request. It's provided to make it easy to review your changes on the staging site. Please note that changes to the data directory will not show up in this table.

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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
repositories/creating-and-managing-repositories/duplicating-a-repository.md	fpt ghec ghes@ 3.14 3.13 3.12 3.11 3.10	fpt ghec ghes@ 3.14 3.13 3.12 3.11 3.10

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

[nguyenalex836]

@viliusddd Thanks so much for opening a PR with this fix! I'll update the branch and get this merged once tests are passing 🍏

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