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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Content directory changes

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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! ⚡

[cmwilson21]

LGTM ✨

[cmwilson21]

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

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