Update licensing-a-repository.md

[ghost]

Fixed the spelling of ShareAlike.

Why: When talking about Creative Commons specifically, ShareAlike shouldn't have a space in it.

Closes: #27387

What's being changed (if available, include any code snippets, screenshots, or gifs): Fixing the spacing of a part of the license name from Share Alike to ShareAlike.

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Source	Preview	Production	What Changed
repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/licensing-a-repository.md	fpt ghec ghes@ 3.10 3.9 3.8 3.7 3.6	fpt ghec ghes@ 3.10 3.9 3.8 3.7 3.6

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

[cmwilson21]

@46009361 Thank you for opening a PR and linking it to your issue! ✨

I'll get this triaged for review! ⚡

[subatoi]

Thanks for raising an issue and PR with this sensible change, and for your interest in the GitHub Docs! ✨

[github-actions]

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