replace '--set-upstream origin' with --set-upstream-to

[dgdg-app]

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Why:

https://stackoverflow.com/a/18032014

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

Git documentation states the call has been deprecated (for confusing syntax) in favor of --set-upstream-to which is self-descriptive and thus more suitable for examples in GitHub's documentation.

Check off the following:

• [x] 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).
• [x] For content changes, I have completed the self-review checklist.

[welcome[bot]]

Thanks for opening this pull request! A GitHub docs team member should be by to give feedback soon. In the meantime, please check out the contributing guidelines.

[github-actions[bot]]

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This comment is automatically generated and will be overwritten every time changes are committed to this branch.

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
get-started/using-git/about-git.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]

@dgdg-app Thank you for opening a PR and providing the link. Could you fill out the pull request template in the top comment in this pull request? Adding additional information to summarize the link will to help speed along the review process.

Thank you! 💖

[github-actions[bot]]

A stale label has been added to this pull request because it has been open 7 days with no activity. To keep this PR open, add a comment or push a commit within 3 days.

[cmwilson21]

@dgdg-app Thanks for the additional context! I'll get this triaged for review! ⚡

[isaacmbrown]

Hi @dgdg-app,

Thanks for contributing. ✨ I'm going to close this PR, because set-upstream-to is not an option for git push (see https://git-scm.com/docs/git-push). It has indeed been introduced, and set-upstream deprecated, but for the git branch command only (https://git-scm.com/docs/git-branch).