Correct "return" in expressions

[Arthur-Milchior]

Why:

Closes #13615

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Source	Staging	Production	What Changed
content/actions/learn-github-actions/expressions.md	Modified	Original

[ramyaparimi]

@Arthur-Milchior
Thanks so much for opening a PR! I'll get this triaged for review ⚡

[skedwards88]

Thanks for this PR! We'll get this merged down for you.

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