fix: format of octokit.js link

[zacanger]

This just happened to bug me when I was browsing the docs — changes to be consistent with the other official library links.

Why:

Closes #22445

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

Fixes format of octokit.js link. This just happened to bug me when I was browsing the docs — changes to be consistent with the other official library links.

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• [ ] 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.

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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
rest/overview/libraries.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]

@zacanger Thank you for opening a PR and linking it to your issue! ✨

I'll get this triaged for review! :zap:

[cmwilson21]

Thanks for this update! I'll get it merged down once all the tests have passed ✅

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