Update keyboard shortcut to meet new style guidelines

[AnilSeervi]

Why:

Closes #13891

What's being changed:

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Content directory changes

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Source	Staging	Production	What Changed
content/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/about-pull-requests.md	Modified	Original

[ramyaparimi]

Thanks so much for opening a PR with this fix! I'll get this merged once tests are passing 🍏

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