Improve caching-your-github-credentials-in-git.md based on my confusion

[JDLH]

Adding section about other Git credential helpers, and mention OAuth.

This is based on my difficulties understanding how to get OAuth authentication from my local Git installation. The current content does not mention OAuth, or the need for organisation approval of OAuth apps not pre-approved by GitHub. Both those omissions caused obstacles for me. This is the content I wished I had at the time.

Why:

Closes: 34710

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

Adding section about other Git credential helpers, and mention OAuth. Add a few words putting GitHub CLI and GCM in relationship to the local Git installation.

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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
get-started/getting-started-with-git/caching-your-github-credentials-in-git.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