Docs: Add 'to' for clarity

[chadmando]

The sentence didn't read well: "You can also trigger a workflow run on a schedule, ..." adding 'to' makes it clearer. "You can also trigger a workflow to run on a schedule,"

Why:

Drive-by contribution. No issue exists.

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

content/actions/learn-github-actions/understanding-github-actions.md Line 62 - adding word for clarity

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

@chadmando Thanks so much for opening a PR! I'll get this triaged for review :zap:

[cmwilson21]

Thanks for this fix, @chadmando! I'll get this merged down once all the tests have passed ✅

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