Update repository names to be consistent

[adamcrews]

This updates the references to a repository name to be consistent throughout this document to avoid confusion. It makes it more clear that a repository has an owner that may not be a username (ie it could be an org name).

Why:

The urls referenced in the various examples were inconsistent. One of my end users was confused about wether they should use their github userid or the org name when updating a url. This change make all of the urls consistent, and used the specific word owner to that should help clarify the name of the repository.

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

I simply updated user and username to be owner, and fix all repo.git to be repository.git

Check off the following:

• I have reviewed my changes in staging (look for the "Automatically generated comment" and click the links in the "Preview" column to view your latest changes).
• For content changes, I have completed the self-review checklist.

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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/getting-started-with-git/managing-remote-repositories.md	fpt ghec ghes@ 3.8 3.7 3.6 3.5 3.4 ghae	fpt ghec ghes@ 3.8 3.7 3.6 3.5 3.4 ghae

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

[cmwilson21]

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

[felicitymay]

@adamcrews - thanks for making this suggestion and opening a pull request to make the change 💖

This seems like a good replacement, but I can see that we also use this pattern in some other articles. I'm going to check in with a few other people and get back to you on this.

[felicitymay]

@adamcrews - thanks for your patience.

Your change looks great and I'll get it merged shortly.

We'll also open an issue to follow up by checking whether other USER or USERNAME placeholders are correct or whether any of them should also be replaced by OWNER.

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