Update duplicating-a-repository.md

[deepansh96]

Why:

Closes #16018

What's being changed:

When I pull a --bare clone of a repository, the name of the folder that gets created is old-repository.git whereas the name specified in the docs is just old-repository.
Updated the same.

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Source	Preview	Production	What Changed
content/repositories/creating-and-managing-repositories/duplicating-a-repository.md	Modified	Original

[ramyaparimi]

@deepansh96
Thanks so much for opening a PR! I'll get this triaged for review ⚡

[guntrip]

Hey @deepansh96! Thanks for spotting and making the change. It looks great! I'm going to update from main and get this merged ✨

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