Fix stray period in Codespaces Quickstart further reading list

[AryanKhandelwal5]

Fixes #45695

Removes a stray trailing period after one link in the "Further reading" section of the Codespaces Quickstart page. All other items in the list don't have a trailing period — this makes it consistent.

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Source	Review	Production	What Changed
codespaces/quickstart.md	fpt ghec	fpt ghec

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[subatoi]

Thanks again, @AryanKhandelwal5—I'll get this merged for you now. Thanks for your interest in the GitHub docs 👍

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