Fix typo in variables.md

[canovasjm]

Why:

Fix typo.

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

The word 'above' is repeated in this sentence.

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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).
• For content changes, I have completed the self-review checklist.

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Content directory changes

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Source	Preview	Production	What Changed
actions/learn-github-actions/variables.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]

@canovasjm Great catch! Thanks for submitting a PR. ⚡

I'll get this merged down once all the checks have passed ✅

[cmwilson21]

LGTM ✨

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