Apply style guide to placeholders in "Troubleshooting commits"

[hsnabszhdn]

Why:

a) The style guide on placeholders is to use all caps:

Style any placeholder text in all caps

style-guide#placeholders

b) These don't look like bash scripts, and therefore I think they are supposed to be placeholders, not variables:

Closes: N/A

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

1. $account -> ACCOUNT
2. $repository -> REPOSITORY

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• For content changes, I have completed the self-review checklist.

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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
pull-requests/committing-changes-to-your-project/troubleshooting-commits/commit-exists-on-github-but-not-in-my-local-clone.md	fpt ghec ghes@ 3.12 3.11 3.10 3.9	fpt ghec ghes@ 3.12 3.11 3.10 3.9

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

[nguyenalex836]

@itecompro 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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